10
Select all combinations
that are possible options within Ben's purchasing
constraints
12 songs and 4 books
15 songs and 9 books
18 songs and 5 books
35 songs and 1 book
x + 4y = 40
DONE
10
20
30
40
5
) Intro

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?