You bought a magazine for $5 and four erasers. you spent a total of $25. how much did you spend on erasers?

This question awards 100 ! i really don’t want to fail i will also mark you !

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?

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).