What is the solution set of this system of equations? y=x^2-3x and x=y+8

The diameter of a table is 5 feet. what is the circumference

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?

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?