Astudent received an 82% on an exam. if there were 50 questions on the exam, which ratio would show the number of questions answered correctly?           a. 82: 50   b. 25: 50   c. 59: 50   d. 41: 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?