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blondinia [14]
3 years ago
15

a student tries out for the track and runs 45 seconds. The coach tell her she will have to cut her time 50% to make the team. ho

w fast must she runs to make the team
Mathematics
1 answer:
olya-2409 [2.1K]3 years ago
4 0
She will have to run in 22.5 seconds.

45 - 50% = 22.5
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dmitriy555 [2]

Answer:

(x^3y)/2

Step-by-step explanation:

7 0
3 years ago
NEED HELP ASAP!!! WILL MARK BRAINLIEST!!!
Lesechka [4]

Answer:

t=4

Step-by-step explanation:

6 0
3 years ago
You are testing the claim that the proportion of men who own cats is significantly different than the proportion of women who ow
otez555 [7]

Answer:

Step-by-step explanation:

This is a test of 2 population proportions. Let 1 and 2 be the subscript for the men and women who own cats respectively. The population proportion of men and women who own cats would be p1 and p2 respectively.

p1 - p2 = difference in the proportion of men and women who own cats.

The null hypothesis is

H0 : p1 = p2

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The alternative hypothesis is

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it is a two tailed test

Sample proportion = x/n

Where

x represents number of success

n represents number of samples

For men

n1 = 80

p1 = 55/100 = 0.55

x1 = p1n1 = 0.55 × 80 = 44

For women,

n2 = 100

p2 = 30/100 = 0.3

x2 = p2n2 = 0.3 × 100 = 30

The pooled proportion, pc is

pc = (x1 + x2)/(n1 + n2)

pc = (44 + 30)/(80 + 100) = 0.41

1 - pc = 1 - 0.41 = 0.59

z = (p1 - p2)/√pc(1 - pc)(1/n1 + 1/n2)

z = (0.55 - 0.3)/√(0.41)(0.59)(1/80 + 1/100) = 3.39

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5 0
3 years ago
Si agrupo mis lápices de 2 en dos me sobra 1; si lo hago de 3 en 3, también me sobra 1 y si lo hago de 5 en 5 ocurre los mismo.¿
Vinvika [58]

Answer:

31 pencils

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What we must do is reduce the range of responses, the first thing is to limit the numbers to the interval between 30 and 40.

If it is two by two and there is one left, it means that all the pairs are eliminated.

If it is five in five and there is one left over, the ones ending in 5 are also eliminated.

If it is three by three and there is one left over, the 33 and 39 are eliminated.

Taking this into account, the possibilities are reduced to two numbers only, 31 and 37.

37 is discarded because when it is grouped from five to five, there are 2 left over.

So the answer is 31, you have 31 pencils.

 

7 0
3 years ago
What do the parallel lines shown on segment BD and segment DC represent? _____________________
postnew [5]

the 2 parallel lines mean that the lines are equal

 SO since BD = 18, DC is also 18

4 0
3 years ago
Read 2 more answers
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