Jane writes numbers on 4 cards. the number has rubbed off the last card, but she knows that the mean of the numbers is 15 13 22 11 what number was on the 4th card?

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

Line l passes through points (0,4) and (3,6) what is the slope of a line that is parallel to line l -2/3 -3/2 2/3 3/2

1. a parachutist is 800 feet above the ground when she opens her parachute. she then falls at a constant rate of 5 feet per second. select the equation that represents this situation. h = -800t + 5 y = -5x + 800 h = 5t - 800 y = 800x + 5 i need