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max2010maxim [7]
2 years ago
8

If 25% of all students in the 7th grade have pets, and there are 40 students with pets, how many total students are there in the

7th grade?
Mathematics
1 answer:
VashaNatasha [74]2 years ago
4 0

Answer:

there would be 160 as if 25% of the student body is 40 then you would multiply it by 4 to get to 100% of the student body thus giving you 160.

Step-by-step explanation:

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I WILL GIVE BRAINLY TO WHOEVER GETS THIS RIGHT PLAESE HELPPP. LOOK AT THE PICTURE.
vesna_86 [32]

Answer:

10.99

Step-by-step explanation:

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7 0
2 years ago
Suppose an experiment consists of randomly drawing a marble out of a bag and replacing the marble. the bag contains 3 yellow mar
Savatey [412]
Hi there!

Since the yellow marbles to the radio of total marbles is 3/15,

3/15 = 5

We need to divide the total amount is times the marble is drawn by the ratio.

20 ÷ 5 = 4

So, the yellow marble would be drawn 4 times.

Hope this helps!
4 0
3 years ago
Read 2 more answers
You work for a consumer advocate agency and want to find the mean repair cost of a washing machine. As part of your study, you r
Alenkasestr [34]

Answer:

90% confidence interval for the population mean is between a lower limit of $92.18 and an upper limit of $107.82.

Step-by-step explanation:

Confidence interval for a population mean is given as mean +/- margin of error (E)

mean = $100

sd = $25.20

n = 30

degree of freedom = n-1 = 30-1 = 29

confidence level (C) = 90% = 0.9

significance level = 1 - C = 1 - 0.9 = 0.1 = 10%

critical value (t) corresponding to 29 degrees of freedom and 10% significance level is 1.699

E = t×sd/√n = 1.699×25.20/√30 = $7.82

Lower limit of population mean = mean - E = 100 - 7.82 = $92.18

Upper limit of population mean = mean + E = 100 + 7.82 = $107.82

90% confidence interval is ($92.18, $107.82)

6 0
3 years ago
Read 2 more answers
How many solutions does the system have?
Maksim231197 [3]

Answer:

B. No solution

Step-by-step explanation:

y = 3x+9

y = 3x-7

Set the two equations equal since they are both equal to y

3x+9 = 3x-7

Subtract 3x from each side

3x+9-3x = 3x-7-3x

9 = -7

This is never true, so there are no solutions

3 0
3 years ago
What is the missing term? Please help me
matrenka [14]

Answer:

6x

Step-by-step explanation:

2x*3x=6x

4 0
2 years ago
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