Miss green's class order three pizzas that cost $18.95 each for a class party. mrs. green uses to $5 off coupons to pay for the pizzas how much money is needed to pay for the pizzas

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

What percent of 18 is 24? and plz explain thx.

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.