Evaluate the expression (-20)-17=

Easy points boii. read it. ya. fresh

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0