The problem says you have 10 books arranged on a shelf and then you are choosing 4 books in alphabetical order.
Given that you are choosing books with an order (alphabetical) it means the order does matter, then it is a permutation (which is an ordered combination).
In this case, no repetitions are allowed because you can't repeat a book in the selection, they'll be 4 different books from the shelf, the formula you have to use is:
[tex]\frac{n!}{(n-r)!}\begin{cases}n=\text{total number of books} \\ r=\text{ number of books you are choosing}\end{cases}[/tex]Then n=10 and r=4, replace these values:
[tex]\frac{10!}{(10-4)!}=\frac{3628800}{720}=5040[/tex]Then, can be chosen 5040 different groups of books.
The answer is option D.
Can someone please help answer the attached?
The variables we need to use in the question are defined. We will call the price of a knife as [tex]k[/tex] and the price of a spoon as [tex]s[/tex].
The total price of [tex]12[/tex] spoons and [tex]16[/tex] knives is then given. Let's write knives instead of [tex]4[/tex] spoons.
[tex]12s+16k=105.64[/tex][tex]3k+16k=105.64[/tex][tex]k=5.56[/tex] per knife.===================================================
Explanation:
k = cost of one knife
s = cost of one spoon
costs are in pounds
12s = cost of 12 spoons
16k = cost of 16 knives
12s+16k = 105.64 pounds is the total cost
We can replace k with 4s because of the phrasing "a knife is 4 times the cost of a spoon". Whatever s might be, quadruple it and it leads us to the value of k.
So,
12s+16k = 105.64
12s+16(4s) = 105.64
12s+64s = 105.64
76s = 105.64
s = 105.64/76
s = 1.39 pounds is the cost of one spoon
k = 4s = 4*1.39 = 5.56 pounds is the cost of one knife
----------------------
Check:
1 spoon = 1.39 pounds
12 spoons = 12*1.39 = 16.68 pounds
1 knife = 5.56 pounds
16 knives = 16*5.56 = 88.96 pounds
12 spoons + 16 knives = 16.68+88.96 = 105.64 pounds total
This fully verifies the answer.
The baseball diamond at a playground is a square with sides that measure 80 feet. About how long would a straight line be from home plate to second base? Round your answer to the nearest tenth.
160 feet
113.1 feet
80 feet
12,800 feet
If the baseball diamond at a playground is a square with sides that measure 80 feet. About how long would a straight line be from home plate to second base is: B.113.1 feet.
Determining the distanceGiven data
Sides measure in feet = 80 feet.
Since the diagonal tend to forms the hypotenuse of a right triangle with both sides of 80 feet
Hence,
Using the Pythagoreans theorem to determine the distance
(80)² + (80)² = x²
6400 + 6400 = x²
x² = 12,800
x = √ 12,800
x = 113.1 feet
Therefore the correct option is B.
Learn more about distance here: https://brainly.com/question/26046491
#SPJ1
Jaclyn has $120 saved and earns $40 each month in allowance. Pedro has $180 saved and earns $20 a month in allowance.
If they both save their entire allowances, how long will it take before Jaclyn and Pedro have saved the same amount of money?
Enter your answer in the box
Answer:
3 months
Step-by-step explanation:
120 + 40m = 180 + 20m
Collect like terms
40m - 20m = 180 - 120
20m = 60
Divide
m = 60/20
m = 3
It will take them 3 months before Jaclyn and Pedro have saved the same amount of money.
Find the inverse of the given function.
5. f= {(1,3), (2,-5), (3,6)}
Check the picture below.
Please help me out with this!
Answer:
10
Step-by-step explanation:
I am not absolutely sure but i think that is correct
Find the measure of
Answer: ∠BDG = 50°
Step-by-step explanation:
We know that a straight line is equal to 180°, meaning that line CDF is 180°.
Next, we know that angle CDB, angle BDG, and angle GDF should all add up to be 180°, since we know CDF is equal to 180°.
Lastly, with all this information in mind, we will set up an equation and solve.
130° + BDG = 180°
∠BDG = 50°
Alysa buys 23 boxes of toothpicks. There are 255 toothpicks in each box. Which equation and solution show the number toothpicks, t, in all the boxes?
Answer:
255 ^t because the amount if toothpicks depend on the number of boxes she/he gets.
When Elizabeth left her phone in her house this morning
Simplify: 15.4 + 3.02
Answer:
18.42
Explanation:
15+3=18
0.4+0.02=0.42
18+0.42=18.42
The area of Eh Kri's rectangular backyard, in square feet, can be found using the expression 2(4x + 5y). Use the distributive property to write an equivalent expression for the area of Eh Kri's backyard.
The area of a rectangular backyard = 2(4x - 5y)
The algebraic expression has a equivalent expression as = 2 x 4x + 2 x 5y
= 8x + 10y
NEEED HELP PLSSSS . Find x in triangles Geometry.
Answer:
10) x = 76,12) x = 8, Perimeter = 77 units=========================
Question 10The triangle is isosceles as marked.
The two opposite angles of equal sides are equal, one of them is x and the angle in between them is 28°.
Use angle sum of the triangle:
2x + 28 = 1802x = 152x = 76Question 12Same as previous question, we have an isosceles triangle. Equal sides are:
3x + 5 = 5x - 115x - 3x = 5 + 112x = 16x = 8Find the perimeter by substituting the value of x:
P = 3*8 + 5 + 5*8 - 11 + 2*8 + 3 = 77 unitsin the diagram below , the measure of arc SQ is 160 degrees and the measure of arc PR is 102 degrees . find the value of x .
Given:
The measure of angle of arrc SQ is 160°.
The measure of angle of arc PR is 102°.
The objective is to find the measure of angle x.
Since, the angle x is away from te center of the circle.
Then, the formula to find the value of angle x is,
[tex]x=\frac{PR+SQ}{2}[/tex]Now, substitute the given values in the above formula.
[tex]\begin{gathered} x=\frac{102+160}{2} \\ =\frac{262}{2} \\ =131\degree \end{gathered}[/tex]Hence, the value of x is 131°.
what is the advantage of reducing process variation, thereby causing process control limits to be at a greater number of standard deviations from the mean? reducing the process standard deviation causes a - select your answer - in the number of defects.
A low standard deviation implies that the data exists grouped around the mean, whereas a large standard deviation indicates that the data exists more dispersed.
What is meant by standard deviation?The term "standard deviation" (or "σ") refers to a measurement of the data's dispersion from the mean. A low standard deviation implies that the data exists grouped around the mean, whereas a large standard deviation indicates that the data exists more dispersed.
The standard deviation is a statistic that expresses how much variance or dispersion there is in a group of numbers. While a high standard deviation suggests that the values are dispersed throughout a wider range, a low standard deviation suggests that the values tend to be close to the established mean.
Because it aids in comprehending measurements when the data is scattered, standard deviation is significant. The standard deviation of the data will be higher the more evenly dispersed the data is.
To learn more about standard deviation refer to;
https://brainly.com/question/475676
#SPJ4
Please help this is urgent your effort is appreciated
Answer:
3
Step-by-step explanation:
Door prizes for entrants in a young inventors competition are $100, $50, $25 and $10. In how many ways can the door prizes be awarded if there are 23 entrants?.
The total number of ways the prizes are awarded is 8855.
The prizes for entrants in a young inventors competition are $100, $50, $25, and $10.
Which are of total 4 types of prizes.
If there are 23 entrants in the competition the prizes can be awarded in the following ways by using Combinations.
Total number of ways = ²³C₄
= [tex]\frac{23!}{4! * (23 - 4)!}[/tex]
= 8855
The total number of ways the prizes are awarded is 8855.
To learn more about Combinations click here:
https://brainly.com/question/13387529
#SPJ4
What is the average rate of change of the function x increases from -3 to 5
The average rate of change when x increases from -3 to 5 is given as follows:
r = (f(5) - f(-3))/8.
What is the average rate of change of a function?The average rate of change of a function is given by the change in the output divided by the change in the input. Hence, over an interval [a,b], the average rate of change is given by the fraction presented as follows:
[tex]r = \frac{f(b) - f(a)}{b - a}[/tex]
In the context of this problem, the input x increases by -3 to 5, hence the change in the input is given as follows:
b - a = 5 - (-3) = 5 + 3 = 8.
The change in the output is given as follows:
f(b) - f(a).
(the problem is incomplete hence the answer is given in general terms).
Then the average rate of change of the function when x increases from -3 to 5 is given as follows:
r = (f(5) - f(-3))/8.
More can be learned about the average rate of change at https://brainly.com/question/24313700
#SPJ1
The headlights of an automobile are set such that the beam drops 2.00 in. for each 28.0 ft in front of the car. What is the angle between the beam and the
Road?
The most appropriate choice for trigonometry will be given by -
Angle between beam and road is 0.33°
What is Trigonometry?
Trigonometry shows the relationship between sides and angles of a right angled triangle.
There are six trigonometrical functions. They are [tex]sin\theta, cos\theta, tan\theta, cos\theta, sec\theta, cosec\theta[/tex]
[tex]sin\theta = \frac{perpendicular}{hypotenuse}\\\\cos\theta = \frac{base}{hypotenuse}\\\\tan\theta = \frac{perpendicular}{base}\\\\cot\theta = \frac{base}{perpendicular}\\\\sec\theta = \frac{hypotenuse}{base}\\\\cosec\theta = \frac{hypotenuse}{perpendicular}\\[/tex]
Trigonometry is a very important tool in mathematics.
Here,
The headlights of an automobile are set such that the beam drops 2.00 in. for each 28.0 ft in front of the car.
According to the figure attached here, 2.0 inch forms the height of the triangle and 28.0 ft forms the base of the triangle
Let the angle be [tex]\theta[/tex]. Now trigonometry is applied here
[tex]tan\theta = \frac{\frac{2}{12}}{28}\\tan\theta = \frac{1}{6 \times 28}\\tan\theta = \frac{1}{168}\\\theta = tan^{-1}\frac{1}{168}\\\theta = 0.33^{\circ}[/tex]
Angle between beam and road is 0.33°
To learn more about trigonometry, refer to the link
https://brainly.com/question/24349828
#SPJ13
what do you divide by 15 to get to 9
Answer:
aproamitly 1.66666666667
Step-by-step explanation: 15/9=1.66666666667 thus
15/1.66666666667=9
Answer: it's 135 the other dude used a calculator probs
Your mom Paid $8 for 10 Granny Smithapples and bought 15 Golden Delicious at60 cents an apple. What is her average costper apple?
First, let's find the total cost of all the apples:
[tex]8+(0.6\cdot15)=17[/tex]Now, we divide this by the total amount of apples bought. In our case, we know that there were 10 Granny Smith apples and 15 Golden Delicious, for a total of 25 apples.
[tex]\frac{17}{25}\rightarrow0.68[/tex]Therfore, we can conclude that the average cost per apple was $0.68
Sean weighs 10 lb more than twice Brad’s weight. If Brad gains 10 lb, together they will weigh 230 lb. How much does each weight now?
Using equations the weight of both Sean and Brad is 156 lbs and 73 lbs.
What do we mean by equations?The equals sign is a symbol used in mathematical formulas to denote the equality of two expressions.An equation is a mathematical statement that contains the symbol "equal to" between two expressions with identical values.as in 3x + 5 = 15, for example.There are many different types of equations, including linear, quadratic, cubic, and others.The three primary forms of linear equations are point-slope, standard, and slope-intercept.
So, the weight of Sean and Brad.
Let, Brad, be 'x'.Then Sean be '2x + 10'So, the equation will become:
x + 2x + 10 = 230
Now, solve this equation for 'x' as follows:
x + 2x + 10 = 2303x = 230 - 103x = 220x = 220/3x = 73.33Rounding off: 73 lbs
Then,
Brad weights ⇒ 73 lbsSean weights ⇒ 2(73) + 10 = 156 lbsTherefore, using equations the weight of both Sean and Brad is 156 lbs and 73 lbs.
Know more about equations here:
brainly.com/question/28937794
#SPJ13
someone please help me!!!
Im going to answer for the first one.So angles 1 and 2 are corresponding angles and so they are equal because line k and line p and parellel
The midpoint of AB is M(0, -7). If the coordinates of A are (-2,-6), what arethe coordinates of B?Answer:Submit AnswerPASSA
Explanation:
The coordinates are given below are
[tex]\begin{gathered} A(-2,-6) \\ M(0,-7) \\ B=(x,y) \end{gathered}[/tex]The image is given below as
To calculate the coordinate of A,we will use the formula below
[tex]M=\frac{(x_1+x_2}{2},\frac{y_1+y_1}{2})[/tex]By substituting the values, we will have
[tex]\begin{gathered} M=\frac{x_1+x_2}{2},\frac{y_{1}+y_{1}}{2} \\ (0,-7)=\frac{-2+x)}{2},(\frac{-6+y}{2}) \\ \frac{-2+x}{2}=0,\frac{6+y}{2}=-7 \\ -2+x=0,6+y=-14 \\ x=2,y=-14+6 \\ x=2,y=-8 \end{gathered}[/tex]Hence,
The coordinate of B will be
[tex]B=(2,-8)[/tex]If α and β are the roots of the equation ax2+bx+c=0,αβ=4ax2+bx+c=0,αβ=4 and a,b,,c are in A. P then α+β=
Considering the sum and the product of the roots of the quadratic equation, it is found that the numeric value of the expression is given as follows:
[tex]\alpha + \beta = -2.5[/tex]
What are the sum and the product of the roots of a quadratic equation?A quadratic equation is defined as follows:
[tex]y = ax^2 + bx + c, a \neq 0[/tex]
The roots of the equation are given as follows:
[tex]\alpha, \beta[/tex]
The sum of the roots is given as follows:
[tex]\alpha + \beta = -\frac{b}{a}[/tex]
The product of the roots is given as follows:
[tex]\alpha\beta = \frac{c}{a}[/tex]
In the context of this problem, the product is of 4, as [tex]\alpha\beta = 4[/tex] hence:
c/a = 4
c = 4a.
The coefficients are in an arithmetic progression, hence:
b = a + d. (d is the common difference of the sequence).c = a + 2d.We have that c = 4a, hence:
4a = a + 2d
2d = 3a
d = 1.5a.
Hence coefficient b is calculated as follows:
b = a + d = a + 1.5a = 2.5a.
Then the sum of the roots is given as follows:
[tex]\alpha + \beta = -\frac{b}{a} = -\frac{2.5a}{a} = -2.5[/tex]
More can be learned about quadratic equations at https://brainly.com/question/24737967
#SPJ1
Stanley runs, swims, and bikes every day. During these workouts, he runs at 9 mph, bikes at 16 mph, and swims at 2.5 mph. Yesterday, he ran for half an hour longer than he swam, and his biking time was twice his running time. How long did Stanley run, swim, and bike yesterday if the total distance he covered was 64 miles?
(a
If Stanley swam for t hours yesterday, what was his running time?
Answer:He biked for 3 hours (48 miles)
He ran for 1.5 hours (13.5 miles)
He swam for 1 hour (2.5 miles)
He covered 62 miles in 5.5 hours of activity
Step-by-step explanation:
Answer:
1.5h
Step-by-step explanation:
Which graph shows the line y-4-2(x+1)?
Solve the following equation: 5(n + 2) = 3(1 + 2n)
Answer: n=7
Step-by-step explanation:
First distribute the numbers to get 5n+10=3+6n
Next Subtract 6n from both sides to get -n=10=3
Finally divide both sides my -1 to get rid of the -n to get n=7
Hope this helps :)
find the missing fraction 1/2+ blank=7/8
To solve this problem we change the structure from
1/2 + ? = 7/8
to
7/8 - 1/2 = ?
Now we need to subtract the fractions and find the difference. To do this, make the denominators (the bottom numbers on the fractions) the same.
1/2 = 4/8
then subtracts the numerator
7/8 - 4/8 = 3/8
there is your answer... 3/8
Please help, i really need help
Answer: m<1 = 146 degrees, m<3 =146 degrees, m<4 = 34 degrees
Step-by-step explanation:
Since m<2 and m<4 are vertical angles, they will be equal to each other.
By using straight lines, we can easily find out that m<1 = 180-34 = 146
Since m<1 and m<3 are vertical angles, they are equal to each other.
Hope this helped :))
4.74 do you own a tablet? a study20 conducted in june 2015 examines ownership of tablet computers by us adults. a random sample of 959 people were surveyed, and we are told that 197 of the 455 men own a tablet and 235 of the 504 women own a tablet. we want to test whether the survey results provide evidence of a difference in the proportion owning a tablet between men and women. state the null and alternative hypotheses, and define the parameters. give the notation and value of the sample statistic. in the sample, which group has higher tablet ownership: men or women? use statkey or other technology to find the p-value.
Null hypothesis, [tex]H_{0}[/tex] P.1 = P2 (The proportion of tablets owned by men and women are equal.)
Alternative hypothesis,[tex]H_{0}[/tex] P1[tex]\neq[/tex]P2 (The proportion of tablets owned by men and women are not equal.)
Sample proportion for men who own tablets ≈0.433
Sample proportion for women who own tablets ≈0.466
p value of the test is 0.3320.
Test whether the survey results provide evidence of a difference in the proportion owning a tablet between men and women.
Let p, be the proportion of all men who own tablets and p, be the proportion of all women who own tablets.
Null hypothesis, [tex]H_{0}[/tex] P.1 = P2 (The proportion of tablets owned by men and women are equal.)
Alternative hypothesis,[tex]H_{0}[/tex] P1[tex]\neq[/tex]P2 (The proportion of tablets owned by men and women are not equal.)
The notations for the sample statistic are p p1 p2
Pooled proportion p = [tex]\frac{x_{1}+x_{2} }{n_{1}+n_{2} }[/tex]= 197+235/455+504
≈ 0.45
Sample proportion for men who own tablets,
p1 = [tex]\frac{x_{1} }{n_{1} }[/tex]= 197/455
≈0.433
Sample proportion for women who own tablets,
p2 = [tex]\frac{x_{2} }{n_{2} }[/tex] = 235/506
≈0.466
Since p1<p2 women group has higher tablet ownership.
Sample statistic, p1-p2
= 0.433-0.466
p value of the test is 0.3320.
What is Null hypothesis?In mathematics, statistics deals with the study of surveys and reports of numerical data. For questions, we need to define a hypothesis. In general, there are two types of hypotheses. One is the null hypothesis and the other is the alternative hypothesis.
In probability and statistics, the null hypothesis is the general statement or default state that zero or nothing will happen. For example, there is no association between groups or no association between two measured events. Here, a hypothesis is generally assumed to be true until other evidence is presented to disprove the hypothesis.
To learn more about null hypothesis, refer;
https://brainly.com/question/19263925
#SPJ4
a ladder 10 feet long rests against a vertical wall. let be the angle between the top of the ladder and the wall, and let be the distance from the bottom of the ladder to the wall. if the bottom of the ladder slides away from the wall, how fast does change with respect to when ?
Rate of change of x with respect to [tex]\alpha[/tex] when [tex]\alpha =\frac{\pi }{3}[/tex] is 5ft/s.
Since the ladder is 10ft long resting against a vertical wall.
Let the angle between the top of the ladder and the wall is [tex]\alpha[/tex] .
And let the distance from the bottom of the ladder to the wall is x.
Thus we need to find the rate of change of x with respect to [tex]\alpha[/tex] when [tex]\alpha =\frac{\pi }{3}[/tex]
Consider L to be the length of the ladder.
Then, L = 10ft
Thus, we get the relation between the angle and distance x i.e.
x = L [tex]\sin \alpha[/tex]
On differentiating the above equation,
[tex]\frac{dx}{dt} =L \cos \alpha[/tex]
Now after putting the values [tex]\alpha =\frac{\pi }{3}[/tex] in above equation, we get,
[tex]=(10)\cos(\frac{\pi }{3} )=(10)(\frac{1}{2} )=5[/tex]
Therefore, [tex]\frac{dx}{dt} =5[/tex] ft/s
To learn more about differentiation visit:
https://brainly.com/question/954654
#SPJ4