Givin f(x)= 3x +1 what is the value of f (-2/3)

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

Ineed me i stuck and i don’t want to get it wrong

What is always true about a positive integer raised to a negative odd power?