If the original quantity is 15 and the new quantity is 4, what's the percent increase?

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

Solve for x in the equation x2 - 12x + 36 = 90. x= 6+3x/10 x=6+2/7 x= 12+3/22 x = 12+3/10

If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.