Answer:
a. The monthly payment of the 5-year loan would be the same as the monthly payment of the 4-year loan, since they have the same interest rate.
b. Since the 5-year loan has a longer repayment period, the total interest paid on the 5-year loan would be higher than the total interest paid on the 4-year loan. This is because interest is calculated based on the principal amount borrowed, and the longer the repayment period, the more interest will accrue.
As for the second part of the question, the length of the diagonal of a rectangle can be calculated using the Pythagorean theorem. In this case, the length of the diagonal would be:
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d = sqrt(20^2 + 15^2)
d = sqrt(400 + 225)
d = sqrt(625)
d = 25 feet
Therefore, the diagonal of the rectangular garden would be 25 feet long.