Domain and range on a graph

In order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.

Solve for x where 0 equation: cot^2x+2cotx+1=0