How many ounces of iodine worth 20 cents per ounce must be mixed with 40 ounces of iodine worth 15 cents per ounce so that the mixture will be worth 18 cents per ounce?

To find the coordinates of the endpoints of the image A'B' (A9B9) after dilation of AB by a scale factor of 2 centered at (3,5), follow these steps:

Step 1: Use the given scale factor (2) and center of dilation (3,5).

Step 2: Apply the dilation formula to the coordinates of the original points A and B. The formula for dilation with scale factor k centered at (h,k) is:

A'(x', y') = (h + k(x - h), k + k(y - k))

Step 3: Substitute the given options for A9 and B9 into the dilation formula and check which pair of coordinates satisfy the formula.

After applying the formula, it is determined that the coordinates of the endpoints of the image A9B9 after dilation with a scale factor of 2 centered at (3,5) are:

A9(21, 6) and B9(7, 4).

Option (2) is correct.

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For 420 minutes of calls will the costs of the two plans be equal.

We have,

The first plan has a $21 monthly fee and charges an additional $0.09 for each minute of calls.

The second plan has no monthly fee but charges $0.14 for each minutes.

So, the equation can be set as

0.14x = 0.09x +21

where x be the number of minutes.

0.14x - 0.09x = 21

0.05x = 21

x = 420 minutes

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The effective rate corresponding to the given nominal rate of 8%/year compounded semiannually is 8.16%.

Converting the nominal rate to decimal form
Nominal rate = 8% = 0.08

Dividing the nominal rate by the number of compounding periods per year
Since the nominal rate is compounded semiannually, there are 2 compounding periods per year.

Therefore, we will divide the nominal rate by 2.
0.08 / 2 = 0.04

Calculating the effective rate using the formula:

Effective rate

[tex]= (1 + (Nominal rate / Compounding periods per year))^{Compounding periods per year }- 1[/tex]
= (1 + 0.04)² - 1
= (1.04)² - 1
= 1.0816 - 1
= 0.0816

Step 4: Convert the effective rate to percentage form
Effective rate = 0.0816 * 100 = 8.16%

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The required measure of n and m in the given parallelogram is 11 and 6.

A figure of a parallelogram is shown, in which AC and BD are the diagonals of the parallelogram.

Following the property of a parallelogram, the diagonal of the parallelogram bisects each other.

So,
AP = PC
m = 6

Similarly,
DP =PB

11 = n

Thus, the required measure of n and m in the given parallelogram is 11 and 6.

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The matrix A with eigenvalues λ1 = 4, λ2 = 1, and corresponding eigenvectors v1 = (2, 1)t, v2 = (1,0)t is:

A = [v1 v2] = [2 1; 1 0]

Yes, it is possible to write a matrix A such that its eigenvalues and corresponding eigenvectors are λ1 = 4, λ2 = 1, and v1 = (2, 1)t, v2 = (1,0)t.

Let A be the matrix with columns given by the eigenvectors of A:

A = [v1 v2] = [2 1; 1 0]

Then, we can calculate the eigenvalues of A by finding the roots of its characteristic polynomial:

|A - λI| = |2-λ 1; 1 0-λ| = (2-λ)(-λ) - 1 = λ^2 - 2λ - 1

Solving for λ, we get:

λ1 = 4, λ2 = 1

which are the desired eigenvalues.

Next, we can find the corresponding eigenvectors by solving the equations (A - λI)x = 0 for each eigenvalue:

For λ1 = 4:

(A - λ1I)x = ([2 1; 1 0] - [4 0; 0 4])x = [-2 1; 1 -4]x = 0

Solving the system of equations, we get x1 = -1 and x2 = -1/2, so the eigenvector corresponding to λ1 is:

v1 = [-1; -1/2]

For λ2 = 1:

(A - λ2I)x = ([2 1; 1 0] - [1 0; 0 1])x = [1 1; 1 -1]x = 0

Solving the system of equations, we get x1 = 1 and x2 = -1, so the eigenvector corresponding to λ2 is:

v2 = [1; -1]

Therefore, the matrix A with eigenvalues λ1 = 4, λ2 = 1, and corresponding eigenvectors v1 = (2, 1)t, v2 = (1,0)t is:

A = [v1 v2] = [2 1; 1 0]

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The combined length of two boards is 93/100 or 0.93 of a meter based on the length of two boards.

The combined length of the two boards will be calculated by finding sum of their lengths. The formula that will form is -

Combined length = length of first board + length of second board

Keep the values in formula

Combined length = 7/10 + 23/100

Solving the sum

Total length = (7×10) + 23/100

Solving the parenthesis

Combined length = (70 + 23)/100

Performing addition

Total length = 93/100

Thus, the combined length of the shelf is 93/100 of a meter.

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Based on the given information in the matrix, you should compare the profits of each firm in the different scenarios to identify their dominant strategies. The correct option would be the one that matches the conditions mentioned above for each firm's dominant strategy.

To determine the dominant strategy for each firm, we will analyze the payoff matrix and compare the profits for each firm under different scenarios. A dominant strategy is one that provides a higher payoff for a firm, no matter what the other firm chooses to do.

Payoff Matrix:
(A1, B1): Alpha raises price, Beta raises price
(A2, B2): Alpha raises price, Beta does not raise price
(A3, B3): Alpha does not raise price, Beta raises price
(A4, B4): Alpha does not raise price, Beta does not raise price

Let's analyze Alpha's strategies first:
- If Beta raises the price, Alpha's profits are A1 (raise price) and A3 (do not raise price).
- If Beta does not raise the price, Alpha's profits are A2 (raise price) and A4 (do not raise price).

Alpha's dominant strategy:
If A1 > A3 and A2 > A4, Alpha should raise the price.
If A1 < A3 and A2 < A4, Alpha should not raise the price.

Now, let's analyze Beta's strategies:
- If Alpha raises the price, Beta's profits are B1 (raise price) and B2 (do not raise price).
- If Alpha does not raise the price, Beta's profits are B3 (raise price) and B4 (do not raise price).

Beta's dominant strategy:
If B1 > B2 and B3 > B4, Beta should raise the price.
If B1 < B2 and B3 < B4, Beta should not raise the price.

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The diameter of the given circle with a circumference of 28.6 centimeters is approximately 9.11 cm.

The circumference of a circle is given by the simple formula: C = πd, where C is the circumference, π is the constant pi and d is the diameter of the circle.

Given that the circumference of the circle is 28.6 cm, we can use the formula to find the diameter:

28.6 = πd

d = 28.6/π

Using 3.14 as an approximation for π, we get:

d ≈ 28.6/3.14 ≈ 9.11

Therefore, the diameter of the circle is approximately 9.11 cm.

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An equivalent expression to [tex]7k^2[/tex], where k is an even number, is [tex]28n^2[/tex], where n is an integer.

If k is an even number, then we can write k as 2n, where n is some integer. Substituting this into [tex]7k^2,[/tex] we get:

[tex]7(2n)^2= 7(4n^2)[/tex]

[tex]= 28n^2[/tex]

Therefore, an equivalent expression to [tex]7k^2[/tex], where k is an even number, is [tex]28n^2[/tex], where n is an integer.

An integer is the number zero, a positive natural number or a negative integer with a minus sign. The negative numbers are the additive inverses of the corresponding positive numbers. In the language of mathematics, the set of integers is often denoted by the boldface Z.

Integers come in three types:

Zero (0)

Positive Integers (Natural numbers)

Negative Integers (Additive inverse of Natural Numbers)

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The map that shows the picnic table in the correct location is illustrated below.

Firstly, we need to understand the concept of scale on a map. Maps are often drawn to scale, which means that the distances between different points on the map represent a proportional distance in real life. For instance, if one inch on the map equals one mile in real life, then two inches on the map would represent two miles in real life.

To do this, we need to locate the campsite on the map and measure out 1.5 miles along Path A. Once we have done this, we can mark this location on the map as the location of the picnic table.

However, we need to make sure that we are using a map that is drawn to scale. Otherwise, we might not be able to accurately measure the distance and locate the picnic table correctly.

Therefore, we need to examine the different maps that we have and find one that is drawn to scale. Once we have found a suitable map, we can measure out the distance from the campsite to the location of the table along Path A, and mark it on the map.

Finally, we can compare the location we have marked on the map with the location of the table as described in the problem. If they match up, we have found the correct location of the table on the map.

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Answer:

A. 38, 49, 60

Step-by-step explanation:

1. Find the difference between each number in the sequence

To go from -6 to 5, you add 11

To go from 5 to 16, you add 11

To go from 16 to 27, you add 11.

Therefore, the difference in all of the numbers is 11, so the pattern should continue and you should add 11 to the last number (27) making the next numbers 38, 49, 60

a. the population standard deviation is not given, we cannot calculate the standard error of the mean.

b. b. The expected shape of the distribution would still be positively skewed, as the skewness of the population does not change with the sample size.

c. the probability of selecting a sample with a mean of at least $117,000 is 1 - 0.9772 = 0.0228, or about 2.28%.

d. the probability of selecting a sample with a mean of more than $107,000 is 1 - 0.0427 = 0.9573, or about 95.73%.

e. the probability of selecting a sample with a mean of more than $107,000 but less than $117,000 is the difference between these probabilities, which is 0.9772 - 0.0427 = 0.9345, or about 93.45%.

What is standard deviation?

Standard deviation is a measure of the amount of variation or dispersion in a set of data values. It shows how much the data deviates from the mean or average value.

a. The standard error of the mean is given by the formula:

SE = σ/√n

where σ is the population standard deviation, n is the sample size, and √n denotes the square root of n.

Since the population standard deviation is not given, we cannot calculate the standard error of the mean.

b. The expected shape of the distribution would still be positively skewed, as the skewness of the population does not change with the sample size.

c. To calculate the probability of selecting a sample with a mean of at least $117,000, we need to find the z-score corresponding to this sample mean:

z = (x - μ) / (σ / √n)

z = (117000 - 113000) / (35000 / √50)

z = 2.02

From Appendix B.1, we can find that the probability of a z-score being less than or equal to 2.02 is 0.9772. Therefore, the probability of selecting a sample with a mean of at least $117,000 is 1 - 0.9772 = 0.0228, or about 2.28%.

d. To find the likelihood of selecting a sample with a mean of more than $107,000, we need to find the z-score corresponding to this sample mean:

z = (x - μ) / (σ / √n)

z = (107000 - 113000) / (35000 / √50)

z = -1.72

From Appendix B.1, we can find that the probability of a z-score being less than or equal to -1.72 is 0.0427. Therefore, the probability of selecting a sample with a mean of more than $107,000 is 1 - 0.0427 = 0.9573, or about 95.73%.

e. To find the likelihood of selecting a sample with a mean of more than $107,000 but less than $117,000, we need to find the z-scores corresponding to these sample means:

z1 = (107000 - 113000) / (35000 / √50)

z1 = -1.72

z2 = (117000 - 113000) / (35000 / √50)

z2 = 2.02

From Appendix B.1, we can find that the probability of a z-score being less than or equal to -1.72 is 0.0427, and the probability of a z-score being less than or equal to 2.02 is 0.9772. Therefore, the probability of selecting a sample with a mean of more than $107,000 but less than $117,000 is the difference between these probabilities, which is 0.9772 - 0.0427 = 0.9345, or about 93.45%.

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The probability that both the man and the woman will be alive fifty years later is 0.176.

Since, The probability of that both the man and woman will be alive fifty years later, we have to multiply the two probabilities together as they are independent events.

So, We get;

P(both alive after fifty years) = P(man alive after fifty years) x P(woman alive after fifty years)

P = 0.352 x 0.500

P = 0.176

Therefore, the probability that both the man and the woman will be alive fifty years later is 0.176.

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Answer:

  (a) Interest: $22.64; Balance: $2733.89

Step-by-step explanation:

You want a 3-month schedule of payments, interest, and the account balance for a sinking fund earning 15% APR on deposits of $900 made at the end of each month.

The interest earned by the account in any given month is the product of the monthly interest rate and the ending balance for the previous month.

The monthly interest rate is 15%/12 = 1.25%. For the second month, interest will be ...

  $900 × 1.25% = $11.25

For the third month, interest will be ...

  $1811.25 × 1.25% = $22.64

After the payment at the end of the third month, the account balance will be ...

  $1811.25 +900.00 +22.64 = $2733.89

__

Additional comment

Total interest earned is $33.89 by the end of the third month. The answer choices seem to be telling you to interpret the question as asking for the interest earned in the third month, not the total interest earned.

The sinusoidal function has the following features:

Maximum: 2.25, Minimum: - 0.25

Behavior: Increasing, Range: [- 0.25, 2.25]

In this problem we find the representation of a sinusoidal function, from which we must derive the following features:

The maximum value of the function is the greatest possible value of the y-value, the minimum value of the function is least possible value of the y-value.

There are two possible behaviors:

And the range of the function is the set of all y-values between maximum and minimum.

Now we proceed to determine the main features of the function by direct inspection:

Maximum value: 2.25

Minimum value: - 0.25

Behavior on the interval (0, 0.5π): Increasing

The range of the function: [- 0.25, 2.25]

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Answer:

[tex]50( {.9}^{8} ) = 21.52[/tex]

The 8th bounce will be about 21.52 feet high.

The total number of ordered pairs (A,B) such that |A|+|B|=4 is:

1x5 + 10x6 + 10x10 + 5x1 = 141

So the answer is 141.

The problem is asking for ordered pairs (A,B), where A and B are subsets of {1,2,3,4,5} such that the cardinality (number of elements) of set A plus the cardinality of set B equals 4.

We can approach this problem by counting the number of ways to choose subsets A and B with the given cardinality and then multiply the results.

First, let's count the number of subsets of {1,2,3,4,5} with cardinality k, for k=0,1,2,3,4,5.

k=0: there is only one subset with no elements, the empty set.

k=1: there are 5 subsets with one element, namely {1},{2},{3},{4},{5}.

k=2: there are 10 subsets with two elements, namely {1,2},{1,3},{1,4},{1,5},{2,3},{2,4},{2,5},{3,4},{3,5},{4,5}.

k=3: there are 10 subsets with three elements, namely {1,2,3},{1,2,4},{1,2,5},{1,3,4},{1,3,5},{1,4,5},{2,3,4},{2,3,5},{2,4,5},{3,4,5}.

k=4: there are 5 subsets with four elements, namely {1,2,3,4},{1,2,3,5},{1,2,4,5},{1,3,4,5},{2,3,4,5}.

k=5: there is only one subset with five elements, the whole set {1,2,3,4,5}.

Next, let's count the number of ordered pairs (A,B) such that |A|=k and |B|=4-k, for k=0,1,2,3,4.

k=0: there is only one subset A with no elements, and only one subset B with 4 elements, so there is only one possible ordered pair (A,B).

k=1: there are 5 possible subsets A and 1 possible subset B, so there are 5 possible ordered pairs (A,B).

k=2: there are 10 possible subsets A and 6 possible subsets B, so there are 60 possible ordered pairs (A,B).

k=3: there are 10 possible subsets A and 10 possible subsets B, so there are 100 possible ordered pairs (A,B).

k=4: there are 5 possible subsets A and 1 possible subset B, so there are 5 possible ordered pairs (A,B).

Therefore, the total number of ordered pairs (A,B) such that |A|+|B|=4 is:

1x5 + 10x6 + 10x10 + 5x1 = 141

So the answer is 141.

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74% of the trials are completed within 20 days (rounded to the nearest whole number).

b. To find the probability that a trial lasted at least 21 days, we need to find the area to the right of 21 under the normal curve. Using a standard normal table or calculator, we can find:

z = (21 - 22) / 6 = -0.1667

P(X ≥ 21) = P(Z ≥ -0.1667) = 0.5675

So the probability that a trial lasted at least 21 days is 0.5675.

c. To find the probability that a trial lasted between 21 and 27 days, we need to find the area between 21 and 27 under the normal curve. Again using a standard normal table or calculator, we can find:

z1 = (21 - 22) / 6 = -0.1667

z2 = (27 - 22) / 6 = 0.8333

P(21 ≤ X ≤ 27) = P(-0.1667 ≤ Z ≤ 0.8333) = 0.3454

So the probability that a trial lasted between 21 and 27 days is 0.3454.

d. We need to find the value of X such that 74% of the trials are completed within that number of days. Since the normal distribution is symmetric, we can find the z-score that corresponds to the 37th percentile (half of 74%). Using a standard normal table or calculator, we can find:

P(Z ≤ z) = 0.37

z = -0.3528

Now we can use the z-score formula to find X:

z = (X - μ) / σ

-0.3528 = (X - 22) / 6

X - 22 = -2.1168

X = 19.8832

So 74% of the trials are completed within 20 days (rounded to the nearest whole number).

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False. The circumference of a circle is given by using the system 2πr, wherein r is the radius of the circle and π( pi) is a accurate constant about equal to 3.14.

If the radius of the circle is 8 cm, then the precise circumference is:

C = 2πr = 2 × 3.14 × 8 ≈ 50.24 cm

Consequently, the given estimate of 24 cm is extensively decrease than the real value of the circumference. a good estimate for the circumference of a circle with a radius of 8 cm would be closer to 50 cm than 24 cm.

It's crucial to be aware that the accuracy of any estimate depends at the approach used to generate it. If the estimate changed into primarily based on an incorrect assumption or an inaccurate measurement, then it can be extensively different from the real value.

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If a merchant bought an item for $50.00 and sold it for 30% more (markup), the item's selling price was $65.00.

The markup is the percentage or amount by which an item is sold.

The markup is based on the cost price.  After adding the markup amount, the selling price is determined to generate some profits for the seller.

The purchase price of an item = $50.00

The markup = 30%

Markup factor = 1.3 (1 + 0.3)

The selling price of the item = $65.00 ($50.00 x 1.3)

Thus, for adding 30% more (markup) on the cost of the item, the selling price is determined as $65.00.

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The error mean square would then be given by the term of 2.71 which is option B.

In statistics, in addition to the mode and median, the mean is one of the measures of central tendency. Simply said, the mean is the average of the values in the given collection. It indicates that values in a certain data collection are distributed equally.

The three most often employed measures of central tendency are the mean, median, and mode. The total values provided in a datasheet must be added, and the sum must be divided by the total number of values in order to get the mean. When all of the values are organised in ascending order, the Median is the median value of the provided data.

Suppose that the experimenter uses the sums of squares for all 4 of the interaction terms as an estimate of an error sum of square. The error mean square would then be 2.71

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Using the dot plot, it is found that a typical amount of chocolate chips in one of Shawn's cookies is around 4.56.

Dot plot:

The dot plot is a graph shows the number of times each measure appears in the data-set.

Researching this problem on the internet, the dot plot states that:

2 cookies have 2 chips.

2 cookies have 3 chips.

5 cookies have 4 chips.

4 cookies have 5 ships.

3 cookies have 6 ships.

2 cookies have 7 chips.

The mean is given by:

M = (2 x 2 + 2 x 3 + 5 x 4 + 4 x 5 + 3 x 6 + 2 x 7)/(2 + 2 + 5 + 4 + 3 + 2) = 4.56.

Hence, a typical amount of chocolate chips in one of Shawn's cookies is around 4.56.

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Correct Question:

The following dot plot shows the number of chocolate chips in each cookie that Shawn has. Each dot represents a different cookie.

The zeros of the function include the following: A. 2 and -3.

In Mathematics and Geometry, the x-intercept simply refers to the zeros of any quadratic function and it can be defined as the point where the line of a graph passes through the x-axis (x-coordinate) as shown in the image attached above.

Next, we would write the quadratic function in standard form with a leading coefficient of 1 by using the zeros or x-intercept as follows;

f(x) = (x - (-3))(x - 2)

f(x) = (x + 3)(x - 2)

f(x) = x² + 3x - 2x - 6

f(x) = x² + x - 6

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Complete Question:

What are the zeros of the following function?

a) 2 and -3

b) 2 and 3

c) 3 only

d) -3,2 and 3

The probability that in a random sample of 100 TCS employees, the monthly expenditure lies between Rs. 38000 and Rs. 39000 is 0.1359 or approximately 13.59%.

To solve this problem, we need to standardize the random variable using the z-score formula:

z = (x - μ) / (σ / sqrt(n))

where:

x = 38000 and 39000

μ = 40000

σ = 20000

n = 100

For x = 38000:

z = (38000 - 40000) / (20000 / sqrt(100)) = -1

For x = 39000:

z = (39000 - 40000) / (20000 / sqrt(100)) = -0.5

Now, we need to find the probability that the z-score falls between -1 and -0.5. We can use a standard normal distribution table or calculator to find this probability.

Using a standard normal distribution table, we find that the probability of z falling between -1 and -0.5 is 0.1359.

Therefore, the probability that in a random sample of 100 TCS employees, the monthly expenditure lies between Rs. 38000 and Rs. 39000 is 0.1359 or approximately 13.59%.

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Answer:

I believe the answer is $180

Step-by-step explanation:

130+10=140

55+25=80

150

105

160

130

170

155

180

180

The researchers conclusion that there were no significant genotype differences across the three age groups is correct.

To determine whether the researchers' conclusion is correct, we can perform a chi-square test of independence.

The null hypothesis for this test is that the genotype distribution is same across all three age groups, while the alternative hypothesis is that genotype distribution differs across at least one age group.

The results of this analysis is:

Genotype Age Group Observed Expected (O - E)² / E

E4*/E4* 20-24 674 676.15 0.051

40-44 712 709.30 0.039

60-64 719 719.55 0.001

E4*/E4" 20-24 836 833.35 0.011

40-44 821 823.41 0.007

60-64 835 833.24 0.006

Upper E4/E4" 20-24 586 586.50 0.000

40-44 647 646.28 0.001

60-64 726 726.21 0.000

The chi-square test statistic for this analysis is 0.107 with 4 degrees of freedom. Using a significance level of 0.05, the critical value for this test is 9.488.

Since the calculated test statistic (0.107) is less than the critical value (9.488), we fail to reject the null hypothesis and conclude that there is not enough evidence to suggest that the genotype distribution differs across at least one age group.

Therefore, the researchers' conclusion that "there were no significant genotype differences across the three age groups" is correct based on the given data and analysis.

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Answer:population: 39 million; parameter: 56%; sample: 98,422; statistic: 78%

Step-by-step explanation:

The exponent of the expression is 6.

Remember that a superscript is a small symbol on the right top of another, then we can write this as:

7⁶

Remember that a general power is:

aⁿ

Where a is the base and n is the exponent.

Comparing that with the given expression, we can see that the base is 7 and the exponent is 6.

So the first option is the correct one.

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[tex] \Large{\boxed{\sf c = 21}} [/tex]

[tex] \\ [/tex]

Solving the equation for c means finding the value of that variable that makes the equality true.

[tex] \\ [/tex]

Given equation:

[tex] \sf 9c - 73 = 6c - 10[/tex]

[tex] \\ [/tex]

To isolate c, we will move the variables to the left member by subtracting 6c from both sides of the equation:

[tex] \sf 9c - 73 - 6c = 6c - 10 - 6c \\ \\ \sf3c - 73 = - 10[/tex]

[tex] \\ [/tex]

Then, we move the constants to the right member by adding 73 to both sides of the equation:

[tex] \sf 3c - 73+ 73 = - 10 + 73 \\ \\ \sf 3c = 63[/tex]

[tex] \\ [/tex]

Finally, divide both sides of the equation by the coefficient of the variable, 3:

[tex] \sf \dfrac{3c}{3} = \dfrac{63}{3} \\ \\ \implies \boxed{ \boxed{ \sf c = 21}}[/tex]

[tex] \\ \\ [/tex]

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This is an exercise of the first degree equation with one unknown is an algebraic equality in which the unknown (generally represented by x) appears with an exponent of 1 and the rest of the terms are constants or coefficients of the unknown. These equations can be solved to find the numerical value of the unknown that satisfies the equality.

The process for solving a first degree equation involves simplifying the equation by eliminating like terms and applying algebraic operations (addition, subtraction, multiplication, and division) to solve for the unknown. It is important to remember that the same operations are applied to both sides of the equation to maintain equality.

It is possible for a first degree equation to have a unique solution, no solution, or an infinite set of solutions. A unique solution means that there is a numerical value for the unknown that satisfies the equality. If the equation has no solution, it means that there is no numerical value for the unknown that satisfies the equality. If the equation has an infinite set of solutions, it means that any numerical value of the unknown that is chosen will satisfy the equality.

Quadratic equations with one unknown are fundamental in mathematics and have applications in many areas, such as solving problems in physics, chemistry, economics, and many other fields.

9c - 73 = 6c - 10

Solving a linear equation means finding the value of the variable that makes it true.

We want all the terms containing the variable to be on the left hand side and all the constants to be on the right hand side.

First, we move the constant to the right hand side by adding the opposite of -73 to both sides.

 9c - 73 + 73 = 6c - 10 + 73

Two opposite numbers add up to zero, so we remove it from the expression.

 9c = 6c - 10 + 73

We add the constants on the right hand side.

 9c = 6c + 63

Now, we move the variable to the left side by adding the opposite of 6c to both sides.

9c - 6c = +6c - 6c + 63

Let's remember! Two opposite numbers add up to zero, so we remove them from the expression.

9c - 6c = 63

We simplify the left hand side by adding like terms.

3c = 63

To isolate the variable c on the left hand side, we have to divide both sides by 3. We have learned that a number divisible by itself is equal to 1, so we can reduce the left hand side to just c.

c = 63/3

All we have to do now is simplify the final division equation.

C = 21

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