This equation shows how the amount of jelly Austin has left is related to the number of sandwiches he makes.

j = –6s + 8

The variable s represents the number of sandwiches he makes, and the variable j represents the amount of jelly remaining. Up to how many sandwiches can Austin make and still have 2 ounces of jelly left?

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?