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Alex777 [14]
3 years ago
14

Sandy drives in town at a rate of 25 miles per hour. It takes her 15 minutes to drive to the store. How far is it to the store?

Mathematics
1 answer:
Phantasy [73]3 years ago
6 0

Answer: 6.25 miles

Step-by-step explanation:

Convert the 15 minutes to 1/4 hr or .25

now multiply 25*.25=6.25 miles

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A true/false test has 40 questions. Suppose a passing grade is 30 or more correct answers. Test the claim that a student knows m
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Answer:

z≈3.16

p≈0.001

we reject the null hypothesis and conclude that the student knows more than half of the answers and is not just guessing in 0.05 significance level.

Step-by-step explanation:

As a result of step 2, we can assume normal distribution for the null hypothesis

<em>step 3:</em>

z statistic is computed as follows:

z=\frac{X-M}{\frac{\sqrt{p*(1-p)} }{\sqrt{N} } } where

  • X is the proportion of correct answers in the test (\frac{30}{40})
  • M is the expected proportion of correct answers according to the null hypothesis (0.5)
  • p is the probability of correct answer (0.5)
  • N is the total number of questions in the test (40)

z=\frac{0.75-0.50}{\frac{\sqrt{0.5*(0.5)} }{\sqrt{40} } } ≈ 3.16

And corresponding p value for the z-statistic is p≈0.001.

Since p<0.05, we reject the null hypothesis and conclude that the student knows more than half of the answers and is not just guessing in 0.05 significance level.

7 0
3 years ago
Felix and Megan are going hiking and are trying to figure out how much water
andreev551 [17]

Answer:

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Step-by-step explanation:

The amount of water they need to bring depends on how long they will be hiking.

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1 year ago
3.1415 is rational or irrational
attashe74 [19]
If it is just the decimal 3.1415 then it is rational. If it is pi it is irrational
7 0
3 years ago
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Find the x and y intercepts 4x-5y=40​
zhannawk [14.2K]

Answer: x = 5/4y + 10

              y = 4/5x - 8

Step-by-step explanation:

7 0
3 years ago
AT&amp;T charges $350 to get a plan with them, plus $60 per month. T-Mobile charges a $275 initial fee, plus $80 per month. Writ
larisa86 [58]

Given :

AT&T charges $350 to get a plan with them, plus $60 per month.

T-Mobile charges a $275 initial fee, plus $80 per month.

To Find :

Write an equation or inequality that can be used to determine the number of months it would take for T-Mobile to cost the same or more than AT&T.

Solution :

Money-time relation of plan AT&T :

M_1 = 60x + 350

Money-time relation of plan T-Mobile :

M_2 = 80y + 275

( Here, x and y are number of months )

Let, after t months would take for T-Mobile to cost the same or more than AT&T.

So, M_2\ge M_1

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