Answer:
4.472135955
Step-by-step explanation:
I used a Calculator

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We have been given that professional plumbers suggest that a sewer pipe should be sloped 0.25 inch for every foot.
Therefore, we can find the slope as:


Therefore, the recommended slope for a sewer pipe is 
51 ft is the answer
Explanation
The hight of the man divided by the hight of school ( which is unknown )
Equal
The length of the shadow of the man divided by the shadow of the school
Cross multiplication and find the value of unknown x which is 51... and ya
Answer:
26mph
Step-by-step explanation:
18 miles at 36mph will take 30 minutes and 26 × 7 is 3 h 30 min