Kelsey keeps track of how much money she makes each time she babysits. For the last 10 jobs she made: $7.50, $10.50, $5.00, $4.50, $3.50, $7.50, $4.00, $10.00, $7.50, and $5.00.
What is the mean amount of money Kelsey made?
A. $5.50
B. $6.25
Ο Ο.
O C. $6.50
D. $7.00
E. $7.50

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?