2 years ago

There are 8 boys on

Mathematics

1 answer:

zloy xaker [14]2 years ago

6 0

Answer:

Step-by-step explanation:

let x represent the total number of students.

8 / x = 16/ 100

16x = 800

x = 50

50 total students

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I need it now plz btw i am in middle school

Svet_ta [14]

Answer:

A)2x+7=38

2x=38-7

2x=31

x=31/2

x=15.5

B)3x-8=52

3x=52+8

3x=60

x=60/3

x=20

C)34%of 68

34/100×68

0.34×68

=23.12

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2 years ago

Simplify -3p3 + 5p + (-2p 2) + (-4) - 12p + 5 - (-8p3). Select the answer in descending powers of p.

BigorU [14]

-3p^3 + 5p -2p^2 - 4 - 12p + 5 + 8p^3
5p^3 - 2p^2 - 7p + 1

It is the second choice

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3 years ago

A multiple choice test has four possible answers for each question. Let X be the number of correct responses in a test of 100 qu

dimulka [17.4K]

Answer:

a. 4.33.

Step-by-step explanation:

If there is only one correct answer out of four alternatives, the expected proportion of correct answers is p =0.25

Sample size (n) = 100 questions

The standard deviation of a proportion 'p' is given by:

$s=\sqrt{\frac{p*(1-p)}{n} }$

Applying the given data:

$s=\sqrt{\frac{0.25*(1-0.25)}{100}}\\s=0.0433$

If X is the number of correct responses in 100 guesses, the standard deviation of X is:

$\sigma = n*s=100*0.0433\\\sigma = 4.33$

The standard deviation of X is 4.33 questions.

7 0

2 years ago

Use the grouping method to factor the polynomial in the box completely.

kvv77 [185]

5x^4(x^3+8x+6) this is the correct answer

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3 years ago

Given the vectors w = <-5, 3> and z = <1, 4>, find the results of the vector subtractions.

Alex

Answer:

Given two linearly independent vectors w and z

We want -w-z

Hence apply a negative gradient to w

w=-<-5,3> =<5,-3>

So <5,-3>-<1,4> = (<5-1>,<-3-4>)

The answer is <4,-7>

6 0

2 years ago