What is the sum? 3/x + 4/x(squared)

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

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

If 25% of y is 30, what is 60% of y?