Answer: a-4b
Step-by-step explanation:
Combine like terms
4a-6b-3a+2b
1a-6b+2b
a-6b+2b
a-4b
The bottom 30% of students failed the final examination. The mean score for the test was 120 and the standard deviation was 17. What was the passing score?
The passing score of the student when the standard deviation and mean are given is calculated to be 111.1.
Standard deviation = 17
Mean = 120
Percentage of students failed in the exam = 30%
Let us find Z such that P(Z< (X - 120)/17) = 0.3
By referring the table, the Z value corresponding to 0.3 probability is observed to be -0.525.
This means that (X - 120)/17 = -0.525
(X - 120) = 17 × -0.525
(X - 120) = -8.925
X = 120 - 8.925 = 111.07 ≈ 111.1
Thus, the required passing score is calculated to be 111.1.
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a credit card company looking for unusual activity examines the number of transactions on a credit card in each of the last 10 months. these numbers are given below. 10 8 7 9 10 6 8 7 9 9 use a calculator to create a frequency distribution. in how many months have 10 transactions occurred?
10 transactions have occurred in 2 months.
In frequency tables or charts, frequency distributions are displayed. The actual number of observations that fall into each range can be seen in frequency distributions, as well as the proportion of observations that do.
To create a frequency distribution:
Count the number of occurrences for each value (in this case, transactions).
Group the values into ranges (if applicable).
Tabulate the frequency (number of occurrences) for each value or range.
For this set of numbers, the frequency distribution is:
Transactions | Frequency
6 | 1
7 | 2
8 | 2
9 | 3
10 | 2
So, in 10 months, 10 transactions have occurred in 2 months.
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Somebody help me please with this question!!
An athlete runs 100 metres in 10.4 seconds work out his average speed in kilometres per hour give your answer to one decimal place 
The average speed in kilometers per hour is 34.61 KMPH if an athlete runs 100 meters in 10.4 seconds .
What is speed ?
Speed is a measure of how fast an object is moving or how quickly an action is taking place. It is usually measured in units of distance per unit of time, such as miles per hour (mph) or kilometers per hour (kph).
Given ,
An athlete runs 100 meters in 10.4 seconds.
And we have to find the average speed in kilometers per hour.
So, average speed = total distance / total time taken
= 100 / 10.4
= 1000/104 meters/sec
So, we have to change units from meters/sec to kilometers per hour
So we multiply with 18/5 .
= 1000 / 104 * 18/5
= 200 * 9 / 52
= 1800 / 52
= 34.61 kmph.
Hence, The average speed in kilometers per hour is 34.61 KMPH if an athlete runs 100 meters in 10.4 seconds .
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A farmer is tilling his rectangular field. The length of the field is 54 meters and distance
between opposite corners is 90 meters. How wide is the farmer's field?
As per the Pythagoras theorem, the width of the farmer's field is 74.83 meters.
In math the term Pythagoras theorem states that the square on the hypotenuse of a right-angled triangle is equal in area to the sum of the squares on the other two sides.
The general form of the Pythagoras theorem is written as,
=> hypotenuse² = opposite side² + adjacent side²
Here we have know that a farmer is tilling his rectangular field.
Where the known length of the field is 54 meters and distance between opposite corners is 90 meters.
As we all know that here we have here is a triangle.
And then here we need to use Pythagorean Theorem is calculated as,
=> 50² + w² = 90²
When we simplify this one then we get,
=> 2500 + w² = 8100
=> w² = 5600
=> w = 74.83
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Selina had been renting for 13 months when there was a flood. The total cost to replace her damaged belongings was $1,960.00. What percent would Selina have saved if she had a renters' insurance policy at a monthly cost of $21.00? Round to the nearest tenth of a percent.
Answer:
13 × 21=293
10/100×293=$29.3
At Lake clay, marine biologist catch, tag, and release 50 small mouth bass. over the next few days, they catch 175 smallmouth bass, of which 7 have the original tags. what is the estimated population of smallmouth bass in lake clay?
Answer: The estimated population of smallmouth bass in lake clay can be calculated using the Lincoln-Petersen index.
This method is based on the idea that the proportion of tagged fish among all the fish caught will be proportional to the proportion of the total population that was tagged.
Formula: N = (C1 * N1) / (C2 - 1)
where N is the estimated population, C1 is the total number of fish caught, N1 is the number of tagged fish caught, and C2 is the number of tagged fish caught among all fish caught.
In this case:
C1 = 175 (total number of smallmouth bass caught)
N1 = 50 (number of smallmouth bass initially tagged)
C2 = 7 (number of tagged smallmouth bass caught among all fish caught)
So, the estimated population of smallmouth bass in Lake clay is:
N = (C1 * N1) / (C2 - 1) = (175 * 50) / (7-1) = 8750
Therefore, the estimated population of smallmouth bass in Lake clay is 8750.
Step-by-step explanation:
with an average, you add everything up and then divide the total by the number of items you are adding. this gives every number equal weight in the average. but what if you want to weight one item more than others? you will use a weighted average. this can be used, for example, to determine your grade in a class. follow these steps to find the weighted average in the problem below. first, convert each percentage to a decimal. then, multiply each percentage in decimal form by its respective grade. and lastly, add everything up to find the weighted average. for example, emily received a 67 on her first economics exam, which counts for 20% of her grade; an 84 on her second exam, which counts for 30% of her grade; and a 78 on her third exam, which counts for 50% of her grade. what is her weighted average in the class?
Answer:
Based on the weights assigned to these grades, Emily's weighted average in the class would be 77.6 marks.
while logistic regression and classification and regression trees (cart) have the same end goal, each model approaches the goal in a different way. discuss the differences in the two models. provide a specific example of a situation where employing a cart model would be preferable to a logistic regression model. explain what makes the cart model superior in your example.
Logistic regression models the probability of a binary outcome, while CART models segment data into categories. For example, CART is preferable when data has complex interactions, as it can partition data into multiple categories.
Logistic regression and classification and regression trees (CART) are two different machine learning models used for binary classification problems. Logistic regression models the probability of one class or the other based on a linear combination of input variables. This makes it useful for predicting a binary outcome, such as whether a customer will purchase a product or not. On the other hand, CART is a decision tree model that divides data into categories. It uses a tree-like structure to split the data into segments based on the input features. This makes it useful for dealing with data with complex interactions, as it can partition data into multiple categories. For example, a CART model would be preferable to a logistic regression model if there are multiple underlying factors that affect the binary outcome. In this case, a CART model could more accurately identify the categories that are associated with a particular outcome. Overall, CART models are superior for dealing with data with complex interactions, whereas logistic regression is better for simpler data.
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X
y
1
17
2
24
3
31
ept of the line represented by the table.
4
38
The slope is of m = 7 and the y-intercept is of b = 10.
How to define the linear function?
The slope-intercept definition of a linear function is given as follows:
y = mx + b.
In which:
The slope m represents the rate of change.The intercept b represents the value of y when x = 0.From the table, when x increases by one, y increases by 7, hence the slope m is given as follows:
m = 7.
Hence:
y = 7x + b.
When x = 1, y = 17, hence the intercept b is given as follows:
7 + b = 17
b = 10.
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A meteorologist drew the accompanying graph to show the changes in relative humidity during a 24-hour period in New York City. What is the range of this set of data?
The range of the data varies from 30 to 80. The correct answer is 30 < y < 80. The option C is correct
What are a domain and range?The range of values that we are permitted to enter into our function is known as the domain of a function. The x values for a function like f make up this set (x). A function's range is the set of values it can take as input. After we enter an x value, the function outputs this set of values.
Given that there is a graph in which the y-axis represents relative humidity and the x-axis represents time.
The range will be the variation of the y value on the graph from minimum to maximum.
The y value varies from 30 to 80 from minimum to maximum respectively. The inequality can be written as 30 < y < 80.
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To estimate the sum of two mixed numbers, Grace rounds one number to 7 and the other number to 4.
Which could be the number she rounds to 7?
A. 7 5/9
B. 7 11/15
C. 6 2/5
D. 6 9/14
According to the concept of fraction, the estimated sum of two mixed number is 7 5/9
In math the term called fraction is defined as a part of a whole number, and a way to split up a number into equal parts.
Here we know that Grace rounds one number to 7 and the other number to 4.
And here we have to find the number she rounds to 7.
Let us consider that x be the number.
And here we have know that
=> x - 7/4 = 7
=> x = 28/7
=> x = 4
Then the resulting number is calculated as,
=> 4 - 7/4 = 16 -7/4
=> 9/4
Then the rounded number is to 7 is 7 5/9.
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a family eats at a restaurant. the bill is $38.00. the family leaves a tip and spends $44.27. how much was the tip as a percentage of the bill?
Answer:
14.16%
Step-by-step explanation:
[tex]=(\frac{44.27-38}{44.27} )(100)=(\frac{6.27}{44.27} )(100)=\frac{627}{44.27} =14.16[/tex]
Hope this helps
Find a formula for the general term a subscript n of the sequenceopen curly brackets 2 over 1 comma space 3 over 4 comma space 4 over 9 comma 5 over 16 comma space 6 over 25 comma space 7 over 36 comma space 8 over 49 comma space 9 over 64 comma space midline horizontal ellipsis close curly brackets Students can use the editor to answer
The formula of the sequence based on geometric progression is 2(3/8)ⁿ⁻¹
The term geometric progression is defined as let a, r are real numbers and an infinite sequence of the form{arⁿ⁻¹} is said to be a geometric sequence this one is refers n'th term of the sequence.
Here we have know that the sequence is written as,
=> {2/1, 3/4, 4/9, 5/16, 6/25, 7/36, 8/49, 9/64..}
Here the value of r is calculated as,
=> (3/4) / (2/1) = 3/4 x 1/2 = 3/8
Then the general formula by using the geometric progression is written as,
=> 2 x (3/8)ⁿ⁻¹
Complete Question:
Find the formula for the general term a subscript n of the sequence {2/1, 3/4, 4/9, 5/16, 6/25, 7/36, 8/49, 9/64..}
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On a coordinated plane, polygon GHIJ translates 8 units to the left to form polygon G1 H1I1J1 what of the following is not necessary true
The initial coordinates of the polygon will change by the rule -
(x, y) → (x - 8, y).
What is the difference between upward, downward, leftwards and rightwards translation?Upward translation : [k] units = When the upward translation take's place then, each point will have its y - coordinate shifted upwards by +k units.Downward translation : [k] units = When the downward translation will take place then, each point will have its y - coordinate shifted downwards by -k units.Leftward Translation : [k] units = When the leftward translation will take place then, each point will have its x - coordinate shifted by -k units to the left.Rightward Translation : [k] units = When the rightward translation will take place then, each point will have its x - coordinate shifted by +k units to the rightGiven is on a coordinated plane, polygon GHIJ translates 8 units to the left to form polygon G1 H1 I1 J1.
Since the polygon is shifted to left, this means only the {x} - coordinate will change. So, the coordinates will change as -
(x, y) → (x - 8, y)
Therefore, the initial coordinates of the polygon will change by the rule -
(x, y) → (x - 8, y).
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a new medical complex being built has a rectangular base. it is 400 ft long, 180 ft wide, and 40 ft tall. if the architect's scale model is 30 in. long, what are the width and height of the model?
The width and height of the model are;
Width of model = 13.5 inches
Height of model = 2.25 inches
How to Interpret the scale Model?A scale model is defined as a physical model that is geometrically similar to an object. Scale models are usually smaller than large prototypes such as vehicles, buildings, or people. However, these scale models may be larger than small prototypes such as anatomical structures or subatomic particles.
Now, we are given that the dimensions of the new medical complex are;
Length = 400 ft
Width = 180 ft
Height = 40 ft
Thus, for a scale model with length of 30 in(2.5 ft) long, the scale factor is; Scale factor = 2.5/400
Thus;
Width of model = 180 * (2.5/400)
= 1.125 ft = 13.5 inches
Height = 30 * (2.5/400)
= 0.1875 ft = 2.25 inches
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Find the volume of a cone, to the nearest cubic inch, with a height of 24 in. And diameter of 40 in. Use 3. 14 for pi
The volume of the cone with mentioned dimensions of height and diameter are 10,048 cubic inches.
The volume of come can be calculated by the formula -
V = πr²h/3, where V represents volume of the cone, r represents radius of the cone and h represents height of the cone. Furthermore, radius is half of the diameter. Hence, calculating radius first.
Radius = 40/2
Performing division on Right Hand Side of the equation
Radius = 20 inches
Keep the values in formula of cone to find the volume of the cone
Volume of the cone = (3.14 × 20² × 24)/3
Performing division on Right Hand Side of the equation
Volume of the cone = 3.14 × 20² × 8
Performing multiplication on Right Hand Side of the equation
Volume of the cone = 10,048 inch³
Thus, the volume of cube is 10,048 cubic inches.
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. All of the following are true about robo-advisors, EXCEPT…
*
Robo-advisors generally have lower fees than a traditional financial advisor
Robo-advisors generally have a higher account minimum than a traditional financial advisor
Robo-advisors use an algorithm to automate the investing process
Robo-advisors generally invest your portfolio based on your goals and risk tolerance
False: Robo-advisors often invest your account in accordance with your objectives and risk tolerance.
what is amount ?aggregate aiming to figure out the amount total number, or time needed. The amount in front of you or being thought about is quite active. the final outcome, its significance, or its import. three accountings: principal, interest, and the third. Word forms include amounts, amounting, and amounted. supple noun How much something is, much you have, the amount that you require or how many you get is its quantity. He needs that much cash to get by.
given
It is true that robo-advisors typically charge less than a traditional financial advisor.
It is true that robo-advisors typically require larger account minimums than a traditional financial advisor.
It is true that robo-advisors automate the investing process using an algorithm.
False: Robo-advisors often invest your account in accordance with your objectives and risk tolerance.
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Tom Sullivan's charge account statement shows an unpaid balance of $1,392. 8. The periodic rate is 2. 5% of
the unpaid balance. If he also has new purchases of $152. 87, what is his new balance?
Tom Sullivan's new account balance after all the transactions that has occurred as per the information provided will be $1,580.49.
Unpaid balance = $1,392. 8
Periodic rate = 2.5%
New purchase = $152.87
New Balance = $1,392. 8 + 2.5% + $152.87
A financial institution's account balance is the sum of money it has on hand during the current accounting period. It is the balance carried forward from the previous month plus the net difference between the credits and debits posted in any given accounting cycle.
An account balance offers current and convenient information about how much money you currently have on hand. An account balance offers a convenient way to manage the money coming in and going out while keeping track of all transactions.
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Enter the resulting inequality.
11 > −2; Subtract 11 from both sides.
The resulting inequality is
If 11 is Subtracted from both sides, the resulting inequality is 9 > -4
How find the resulting inequality?
An inequality is a relationship that makes a non-equal comparison between two numbers or other mathematical expressions e.g. 2x > 4
Initially, you have 11 > −2
If you subtract 11 from both sides, you will have:
11 -2 > −2-2
9 > -4
Thus, the resulting inequality will be 9 > -4
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In the figure, ABCD is a square, E is the midpoint of side AD, and F is the midpoint of side BC. The area of the shaded region is
what fraction of the area of square region ABCD?
Answer:
option (D) is the correct one ...
MARK ME AS BRAINLIEST ...Mrs.Henderson has 16 boys in her class of 24 students. Mr.Gregory has 18 boys in his class of 30. Which class has the greater ratio of boys to student s? Explain
The greater ratio of boys to students in the class of Mrs. Henderson's class is, 0.67
What is the ratio?A ratio in mathematics is a comparison of two or more numbers that shows how big one is in comparison to the other. The dividend or number being divided is referred to as the antecedent, while the divisor or number that is dividing is referred to as the consequent.
Given that,
Mrs. Henderson has 16 boys in her class of 24 students
Mr. Gregory has 18 boys in his class of 30
Greater ratio = ?
Ratio in Mrs. Henderson = number of boys/total students
= 16/24
= 2/3
= 0.67
Ratio in Mrs. Gregory = number of boys/total students
= 18/30
= 3/5
= 0.6
Hence, the ratio is greater in Mrs. Henderson's class 0.67
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xyz university claims that their graduates earn more than abc university graduates on average. the average salary of abc university as advertised on their website is $115,275. in this case, for xyz university the correct research hypothesis to test would be:
The average salary of xyz university = $138330
The average salary of abc university is $115275 as provided in the question and also mentioned condition on the average salary of xyz university.
given that the average salary of xyz universtiy is greater than abc univeresity by 20% of the average salary of abc university.
so 20% of average salary of abc university = 0.2 * 115275 = 23055
so the average slary of xyz university is 23055 greater than average slary of abc university
so the avergae salary of xyz university is given by:
= 115275 + 23055
=> 138330
so the average salary of xyz university = $138330
To know more about The average salary of xyz university = $138330
The average salary of abc university is $115275
given that the average salary of xyz universtiy is greater than abc univeresity by 20% of the average salary of abc university.
so 20% of average salary of abc university = 0.2 * 115275 = 23055
so the average slary of xyz university is 23055 greater than average slary of abc university
so the avergae salary of xyz university is given by:
= 115275 + 23055
=> 138330
so the average salary of xyz university = $138330
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Complete question :
xyz university claims that their graduates earn more than abc university graduates on average. the average salary of abc university as advertised on their website is $115,275. Find the average salary of xyz university given that the difference betwwen the salary is 20 % of avergae salary of abc university.
Therefore $138330 is the average income at xyz university.
According to the information in the question and the conditions on the average pay at xyz university,
the average salary at ABC University = $115275.
the average income at xyz University = 20% higher than the average at ABC University.
,20% of ABC University's average income = 0.2 x 115275,
= 23055.
The average pay at XYZ University is = 115275 + 23055
= 138330
The xyz university's average income is $138330.
the average pay at ABC University = $115275
20% of ABC University's average income = 0.2x115275
= 23055.
the average pay at XYZ University = 115275 + 23055
= 138330
Therefore $138330 is the average income at xyz university.
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Complete question :
xyz university claims that their graduates earn more than abc university graduates on average. the average salary of abc university as advertised on their website is $115,275. Find the average salary of xyz university given that the difference betwwen the salary is 20 % of avergae salary of abc university.
and number is doubled and the result is increased by 8 if the final result is 36
Answer:
14
Step-by-step explanation:
36 - 8 = 28
28 / 2 = 14
What is an equation of the line that passes through the points \(4,1) and (8,−4)?
m = (1--4) / (4-8)
m = 5 / -4
m = -1.25
y = mx + c
1 = -1.25(4) + c
1= -5 + c
c = 6
y = -1.25x + 6
Solve by substitution.
x - 2y = 3
2x + 4y = 6
([?], [ ]
Enter
[tex]\begin{cases} x-2y=3\\ 2x+4y=6 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{using the 1st equation}}{x-2y=3}\implies x=2y+3 \\\\\\ \stackrel{\textit{substituting on the 2nd equation}}{2(\underset{x}{2y+3})+4y=6}\implies 4y+6+4y=6\implies 8y+6=6 \\\\\\ 8y=0\implies y=\cfrac{0}{8}\implies \boxed{y=0}\hspace{5em}\stackrel{2(0)+3}{\boxed{x=3}} \\\\[-0.35em] ~\dotfill\\\\ ~\hfill (3~~,~~0)~\hfill[/tex]
solutions to y<-x and 2x+y>2
The solution to the inequality is (2, -2)
How to determine the solution to the inequalityFrom the question, we have the following parameters that can be used in our computation:
y<-x and 2x+y>2
Express them as equations
So, we have
y = -x and 2x + y = 2
This gives
2x - x = 2
Evaluate
x = 2
Recall that
y = -x
So, we have
y = -2
Hence, the solution is (2, -2)
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Work out the surface area of this cylinder.
Give your answer in terms of .
10 cm
22 cm
Optional working
Answer+ cm²
The approximate surface area of the given cylinder is 2010cm^2. The solution has been obtained using area of cylinder.
What is area of cylinder?
The entire area a cylinder occupies in three dimensions is known as the cylinder's area. The combined areas of the two circular bases and the curving surface make up the cylinder's surface area. In right cylinders, the axis line creates a right angle to the base, and the two circular bases are perfectly over one another. It is referred to as an oblique cylinder if one of the circular bases is misaligned and the axis does not make a right angle with the base.
We are given radius(r) as 10cm and height(h) as 22cm.
We know that area of cylinder (A) = 2πrh + 2πr^2
So, using this, we get
⇒A = 2*3.14*10*22 + 2*3.14*10*10
⇒A = 1381.6 + 628
⇒A = 2009.6 = 2010cm^2
Hence, the approximate surface area of the given cylinder is 2010cm^2.
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These two images show steps in a proof of the Pythagorean theorem. Which of the following statements about the proof is false?
Brainliest if correct.
A. the area of the interior square in step 2 is equal to the combined area of the two interior squares in step 1.
B. The triangles in step 1 have the same combined area as the triangle in step 2.
C. The area of the interior square in step 2 is equal to c2 + ab.
D. The proof shows that a2 + b2 = c2.
Step 2's inside square has a larger area than Step 1's two interior squares taken together.
Explain about the Pythagoras theorem?According to the Pythagorean theorem, the square of the hypotenuse of a right-angled triangle equals the sum of the squares of the two shorter sides.
In a right-angled triangle, the square of the hypotenuse side is equal to the sum of the squares of the other two sides, according to Pythagoras's Theorem. These triangle's three sides are known as the Perpendicular, Base, and Hypotenuse.
Assume that the triangle ABC has sides measuring a, b, and c, and that a2 + b2 = c2. A second triangle with sides of lengths a and b and a right angle should be built. The hypotenuse of this triangle has length c = a2 + b2, matching the length of the hypotenuse of the first triangle according to the Pythagorean theorem.
According to the Pythagorean theorem, two squares added together equal the square of the longest side.
The Pythagoras theorem's equation is as follows:
H² = P² + B²
The procedures of proving the Pythagorean theorem are depicted in these two pictures.
Step 2's inside square has a larger area than Step 1's two interior squares taken together.
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On a graph, the line representing Tony's distance covered with respect to time would be speed is Mark's. meters per minute and the unit rate for Mark is 2 3227 Mark's line. So, Tony's walking
Tony's walk speed exists 2 meters per minute slower then Tony's walk speed.
What is meant by equation?An equation in algebra is an equality claim that includes one or more variables or unknowable things.
The definition of an equation in algebra is a mathematical statement that proves two mathematical expressions are equal. Two expressions joined by an equal sign form a mathematical statement known as an equation.
A number, a variable, or a mix of both plus certain operation symbols make up an expression. An equal sign separates two expressions that make up an equation.
Tony : d = 108m
Tony walks 108 meters per minute
Mark : (10,1100),(20,2200)
slope = (2200 - 1100) / (20 - 10) = 1100/10 = 110 meters per minute
Therefore, Tony's walk speed exists 2 meters per minute slower then Tony's walk speed.
The complete question is:
Tony writes an equation to represent the distance he walks in meters, d, in relation to the number of minutes he walks, m. d = 108m Mark has created a table to record the number of minutes it took him to walk different distances in meters. Time (minutes) Distance (meters) 10 1,100 20 2,200 40 4,400 Assuming that Tony and Mark both walk at a constant rate, the unit rate for Tony is meters per minute and the unit rate for Mark is meters per minute. On a graph, the line representing Tony’s distance covered with respect to time would be Mark’s line. So, Tony’s walking speed is Mark’s.
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