What is the value of the expression 5/6 divided by 1/8

Solve the system of equations. y= 2x y= x^2 - 15

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.