Mr. kole has 30 students in his class. he has twice as many girls as boys. what is the ratio of boys to total students? 1: 3 1: 2 2: 3 2: 1

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years