HELP ME PLZZ I NEED HELP WITH THIS!!

Aregression was run to determine if there is a relationship between hours of tv watched per day (x) and number of situps a person can do (y). the results of the regression were: y=ax+b a=-0.662 b=30.418 r2=0.703921 r=-0.839

Cot(90° − x) = 1 the value of x that satisfies this equation is °. a. 60 b. 135 c. 225 d. 315

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function