An appliance repairman named steve corino charges $55 per trip plus $15 per hour for labor. the cost of fixing a stove was $92.50. write an equation where x represents the number of hours of labor.

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?