Enrique has $127 in his bank account. Each month he adds $25 to the account.

Which equation represents the dollar amount, d, in his account after m months?
d = 127 m - 25
d = 127 m + 25
d = 127 - 25 m
d = 127 + 25 m

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?