Lesly took a test with 30 questions. The ratio of correct answers to incorrect answers for Lesly was 7 to 8. How many answers did she get correct?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?

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?