You estimate that there are 66 cars in a parking lot. the actual number of cars is 75. find the percent error

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

Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.

Abag contains pieces of paper numbered from 5 to 9. a piece of paper is drawn at random. what is the theoretical probability of drawing a number less than 8?