How do athletes use mathematics to enhance their performance in the olympic games?

Can someone check my answer? you : )

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

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?