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igor_vitrenko [27]

1 year ago

8

The results of a standardized test are normally distributed. The mean test score is 312. Of the scores, 16% are under 307. What

is the standard deviation?
A: 10

B:5

1 answer:

amid [387]1 year ago

4 0

Answer:

the answer is B five

Step-by-step explanation:

three hundred and seven minus three hundred and twelve

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What is the y-intercept of f(x)=(1/4)^x<br> A. (1,0)<br> B. (1 1/14)<br> C. (0,0)<br> D. (0,1)

evablogger [386]

Answer:

D

Step-by-step explanation:

firstly,y-intercept, x=0,A and b wrong

sub x=0

0.25⁰=1

(0,1)

D

6 0

2 years ago

The length of the rectangle is 5 inches more than the width. The perimeter of the rectangle is 42 inches. Write an equation to m

Sunny_sXe [5.5K]

Answer:

<h2>Length = 13 in. </h2>

Step-by-step explanation:

perimeter of a rectangle (P) = 2L + 2W

where;

P = 42 in.

Length (L) = 5 + W

Find:

length (L) of the rectangle

solution:

P = 2L + 2W

42 = 2(5 + W) + 2W

42 = 10 + 2W + 2W

42 - 10 = 4W

32 = 4W

W = 32/4

W = 8

Length (L) = 5 + W

= 5 + 8

= 13 in

proof:

42 = 2(13) + 2(8)

42 = 42 in

4 0

3 years ago

1. Write the equation for a line in point slope form that had a slope of 4 and passes through (1,1)

Dahasolnce [82]

Solution:

<u>Note that:</u>

Slope = m = 4
Given point: (x₁,y₁) = (1,1) [x₁ = 1; y₁ = 1]
Formula: y - y₁ = m(x - x₁)

<u>Use the formula to convert the line in point slope form.</u>

y - y₁ = m(x - x₁)
y - 1 = 4(x - 1)

The equation of the line (In point slope form) is y - 1 = 4(x - 1).

8 0

2 years ago

Read 2 more answers

The average height of middle school students at Seton Grove School is found to be 5.25 feet. Which sample makes this generalizat

Reika [66]

Answer:

C

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

A number consists of two digits whose sum is 12. If 16 is added to the number, then one of the digits is four times the value of

NeX [460]

Answer: The number is 12.

Step-by-step explanation:

Since we have given that

Sum of two digits = 12

Let the one's digit be 'x'

Let the ten's digit be '12-x'

So, Original number would be

$x+10(12-x)\\\\=x+120-10x\\\\=-9x+120$

If 16 is added to the number, then one of the digit is four times the value of the other.

According to question, we get that

$-9x+120+16\\\\=-9x+136$

so, the one's digit be 'x'.

Let the ten's digit be '4x'.

so, New number would be

$10x+4x=14x$

According to question, it becomes,

$14x=-9x+136\\\\14x+9x=136\\\\23x=136\\\\x=\dfrac{136}{23}=12$

So, the number would be

$-9x+120=-9\times 12+120=-108+120=12$

Hence, the number is 12.

7 0

3 years ago