Identifying rays and segments
which statements are true? check all that apply.
line xy contains ray ox and ray oy.
line xy contains segment yx.
cand ac are different segments.
ray ba exists in the diagram.
ray yx exists in the diagram
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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

The anwser cause i do not understand just plez

In chemistry,n molecules of an ideal gas have pressure, volume, and tempersture that stand inthe following relation, where r is constant. solve the equation for n,the number of molecules. pv=nrt