...Well basically the questions are

A hawk is on top of a tree looking down at a mouse with the angle of depression at 63 degrees. 20 feet below the hawk, an owl is looking at a mouse with an angle of depression at 48 degrees. What is the height of the tree?

let x = horizontal distance from the tree to the mouse

solve the system for h

And then

y=xsquared tan x is the function positive, negative, or neither?

you sure you don't meanodd, even, or neither?