5x+y=-24 x+3y=-2
substitution problem

The square root of 9x plus 7 plus the square rot of 2x equall to 7

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?

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?