Find the derivative of -4x^2+16 / (x^2+4)^2

You went to a restaurant and spent $53.25 on the meal. there was a 6% sales tax. what was the amount of money, not including a tip, you spent at the restaurant?

Jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {

The water level in the aquarium's shark tank is always greater than 25 feet. if the water level decreases by 6 feet during cleaning, what was the water level before the cleaners took out any water?