1/x, x/3. 80%, what does x equal?

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

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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