The mean of five numbers is 23. if four of the number are 19, 21, 24, 25, what id the fifth number?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

This is so hard and it’s for a test

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