Algebraic expressions

Solve

i. n times 7
ii. n divided by 8​

Which fraction below is equivalent to 10/12?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?