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Answered problems by math tutors.

A soccer coach wants to know how many hours a week his players spend training at home. He has 20 players and he decides to ask the first 4 players to arrive at Monday's soccer practice how many hours they spend training per week. He then calculated that they spend an average of 10 hour per week. Therefore, he assumed that all the players train 10 hours per week. Is this an example of a simple random sample? 

A No, because each student did not have an equal chance of being selected. 

B Yes, because each student had an equal chance of being selected. 

C No, because he did not sample every soccer player. 

D Yes, the minimum number of students sampled need to be four for it to be a simple random sample. 

The figure shows the graph of f. 

(b) Which of the cx-values A, B, C, D, E, F and G appear to be inflection points of f? 

The diagram shows two rectangles, A and B. 

All measurements are in centimetres. 

The area of rectangle A is equal to the area of rectangle B. 

Find an expression for y in terms of w. 

George's page contains twice as many typed words as Bill's page and Bill's page contains 50 fewer words than Charlie's page. If each person can type 60 words per minute, after one minute, the difference between twice the number of words on Bill's page and the number of words on Charlie's page is 210. How many words did Bill's page contain initially?

 Bill's page initially contained        words. 

Simplify 2sin(5x)cos(3x) - sin(2x) to one an expression containing one trigonometric function. Then graph the original function and your simplified version to verify they are identical. Enclose arguments of functions in parentheses. For example, sin(2x). 

2sin(5x)cos(3x)-sin(2x)=

A health psychologist was interested in the effects of vitamin supplements on the immune system. Three groups of adults were exposed (in a highly ethical way) to the cold virus; one group took no supplements for a week before exposure, another had vitamin C supplements, and a third had multivitamins (excluding C). The severity of the cold was measured as a percentage (0% = not contracted, 100% very severe symptoms). The psychologist also measured the number of cigarettes that each person smoked per day, as smoking suppresses the immune system. The psychologist was interested in the differences in the severity of the illnesses across different vitamin groups accounting for cigarette usage. What technique should be used to analyse these data? 

A. Two-way repeated-measures ANOVA 

B. Two-way independent ANOVA 

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You are assigned 50 math exercises for homework. You complete 44% of these before dinner. How many have you done? How many do you have LEFT to do after dinner?

Related questions.

can someone please help me on this?? ill mark branliest for the best answer

12 -1/9d = 17

Subtract 12 from both sides

Multiply both sides by -9:

The answer is b. d = -45

Step-by-step explanation:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    12-1/9*d-(17)=0

Simplify 1/9

2.1   Subtracting a fraction from a whole

Rewrite the whole as a fraction using  9  as the denominator

 Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible

Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.

Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.

Now, on the left hand side, the  9  cancels out the denominator, while, on the right hand side, zero times anything is still zero.

Add  45  to both sides of the equation :

                     -d = 45

Multiply both sides of the equation by (-1) :  d = -45

Hope this helps1

-4 x h = -14 solve for h?

Given f(x) = 3(6 -x), what is the value of f(-8)

The value of the given function f(x) = 3(6 -x)  at x = -8 will be 42.

A function is a relation between a independent variable and a dependent variable such that the value of dependent variable depends upon the independent one. It is denoted by f(x).

Given is a function of [x] as follows -

f(x) = 3(6 -x)

We have the following function -

Now, we will evaluate the given function at x = -8.

f(- 8) = 3{6 - (-8)}

f(- 8) = 3 x 14

f( - 8) = 42

So, the given function is equal to 42 at x = -8.

Therefore, the value of the given function f(x) = 3(6 -x)  at x = -8 will be 42

To solve more questions on Evaluating functions , visit the link below-

https://brainly.com/question/24971874

A 14-inch candle burns at a rate of 1 inch per hour. Draw a graph to model this situation. How long will the candle last?

Three times a number minus nine is zero. What is the number? Write the two step equation. Use x for the variable. Now solve for x.

PLEASE HURRY AND HELP!

The answer is b

-1/2 p + -1 = -3 - p

-1/2 p -1 = -3 - p

            +1  +1

_______________

-1/2 p = -2 -p

+p              +p

______________

____________

What sum of money will amount to Rs.3630 in 2 yrs at 10%pa compound interest?

Kendra is using 27 blue patches and some white patches to make a quilt. The quilt a total area of 540 square inches each patch has an area of 5 inches how much of the area "is white

Given that :

Total area of quilt = 540 in²

Number of Blue patches = 27

Number of white patches = x

Area per patch = 5 in²

Area of white = total area - total area of blue patch

Total area of blue patch = 27 * 5 in² = 135 in²

Area that is white :

540 in² - 135 in²

what’s the answer plz help ?

find the circumference of a circle (the bottom one) then times it by 2 to get the top and times it by 6 afterwards

Find the measure of each angle indicated

exterior angle = sum of opposite interior angles

exterior angle = 40 + 80

plz mark my answer as brainlist . h o p e this will be helpful to you .

Given f(x) = -3/4 x + 2, find f(16).

Step-by-step explanation :

Hope this helped

Does anybody understand this?

yes im doing them right now

the anwsers are c and a

0.1784 to 2 decimal places

I need help ASAP!!! Please explain

the answer is 9.4

9 4/10= 9+1/10

we know that 4/10 is the same as 4÷10.

9 4/10=9+(4÷10)

then using long division for 4 divided by 10 we have:

a plumber charges a $65 fee for a repair plus $35 per hour. write an equation to model the total cost y of a repair that takes x hours.

Step-by-step explanation: $65 is the fee, added to x which represents the amount of hours, y is the total cost

In the diagram, the measure of 1 is 55°. If line y is rotated 5° clockwise about the point of intersection, what is the new measure of 3? A. 60° B. 130° C. 120° D. 50° PLEASE LOOK AT THE PICTURE!! ​

Answer: it’s 60 degrees

TEMA: Propriedade de Potência e Multiplicação de Números Negativos e Positivos. Alguém poderia solucionar, passo a passo, como resolver uma multiplicação entre um número negativo e outro positivo em qualquer potência? Usando a da foto como exemplo? Seria de uma enorme utilidade.

Which equations for the measures of the unknown angles x and y are correct? Check all that apply. - a <= cos() O x=sin(6) b O x = tan-1 y Dy=sin 1(a) Oy=cosho)

b. x=sin^-1(a/c)

c. x=tan^-1(c/a)

e. y=cos^-1(c/b)

The measures of the unknown angles are x = sin⁻¹(c/b), x = cos⁻¹(c/a) and y = tan⁻¹(c/b)

A trigonometric ratio is a ratio of the length of sides of a right-angle triangle . It relates the ratio of sides to the respective angle . The most common trigonometric ratios are sine, cosine, and tangent.

Given is a right-triangle , we need to find the unknown angles ,

In the right triangle of the figure,

For the angle x :-

cos x = a/b

x = cos⁻¹(a/b)

sin x = c/b

x = sin⁻¹(c/b)

tan x = c/a

x = tan⁻¹(c/a)

For angle y :--

cos y = c/b

y = cos⁻¹(c/b)

sin y = a/b

y = sin⁻¹(a/b)

tan y = a/c

y = tan⁻¹(c/b)

Hence, the measures of the unknown angles are x = sin⁻¹(c/b), x = cos⁻¹(c/a) and y = tan⁻¹(c/b)

Learn more about trigonometric ratios click;

https://brainly.com/question/25122825

Expand and simplify the polynomial below. Select all the expressions that make up the simplified expansion (2x– 1)(8x – 5)​

you just have to bring 2 to 8 and 5 to 1 so change side like if its 2 than it will be minus 2 on the other side when your moving it with 3

Austin had both chocolate cake and coconut cake at his birthday party. There were 50 people at the party, and 70% of them picked chocolate cake. How many people picked chocolate cake?

Let's start by figuring out 10% of 50.

10% of 50 is 5, so we can multiply 5*7 (10% times 7) to figure out how many people picked chocolate cake. 5*7=35, so 35 people at the party picked chocolate cake.

first we gonna devide 50 by 10=5 after we gonna do 5*7=35 and so 35 people picked the chocolate cake

URGENT PLEASEEEE HELPPPP

they should get 8/3 each but because of your question the answer lies between 2 and 3

if 3 cats and 8 once then 8 divided by 3 is 8/3 which is about 2/6667 then that is between 2 and 3. Done!

The bookstore has 4 women's magazines and 76 other magazines. What percentage of the magazines at the bookstore are women's magazines?

This question is dealing with fractions and percentages.

Fractions and percentages are just means of expressing a part of a whole portion.

percentage of magazines that belong to women is = 5%

Number of women magazines = 4

Number of other magazines = 76

Total number of magazines = 4 + 76 = 80

percentage of magazines that belong to women is; [tex]\frac{4}{80}[/tex] × 100

Read more at; brainly.com/question/13104179

Which statement is true? A) The value of money that you save increases over time. B) The value of money remains constant over time. C) The present value of money is greater than its future value.

I would say A

It is anything but A. There is too much money floating around to maintain its value or buying power. The Federal Reserve just keeps on printing more. The net effect is that your money is worth less because there is more of it.

B: Our problem is that money does not remain constant. The answer cannot be B

C: is the answer. That is exactly what is happening today.

evaluate the expression 6+4×{3+7}​

Step-by-step explanation: i thibnk 13

yeah i think its 13

I struggle on this one to

if sales tax in california is 7.25%, how much would it cost devon to buy a t-shirt at $12.00, a pair of pants that cost $25.00, and shoes at $42.00?

the answer is D: $84.73 :)

To solve, add up the total cost then multiply by the sales tax decimal. Add to the total sum.

William is planning on driving his car to the family reunion. The diotance to the meeting place in 956 milea. If his car geta 32 mpg, how many gallons of gas will he need? A. 39.9 B. 19.9 C. 49.9 D. 29.9

The answer would be D. 29.9 :)

What fraction of a full turn is 120°?​

[tex]\frac{1}{3}[/tex]

A full turn is 360° , thus

fraction of full turn = [tex]\frac{120}{360}[/tex] = [tex]\frac{1}{3}[/tex]

Math work...HELPPPP!

2] The DiPietro family ate at a restaurant. The cost of the meal was $87.50. The sales tax was 6% of the cost of the meal. . They left a tip of 15% of the cost of the meal plus tax. . What was the total cost of the meal, tax, and tip? SHOW WORK PLEASE

87.50 * 0.15 = 13.13 this gets you the 15% tip

87.50 * 0.06 = 5.25 this gets you the 6% sales tax

87.50 + 13.13 + 5.25 = 105.88

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