The ratio of the cost of a tennis racket to tennis balls is 18: 1. if a can of balls cost $5.35, what is the cost of the racket?

Given the box plot, will the mean or the median provide a better description of the center? box plot with min at 10.5, q1 at 11.5, median at 12.5, q3 at 13.5, max at 15

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?