Me
chase plays the piano and the cello. for every 2 hours he practices the piano, he practices the cello for 4 hours. if he practiced the piano for 5 hours last week, how many hours did he spend practicing the cello?
a.
10
b.
40
c.
20
d.
8

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?