A mailbox that is 36 inches tall is beside a tree. The length of the mailboxes shadow is 28 inches. The length of the trees shadow is 98 inches. How tall is the tree in feet.

A80-foot piece of siding is cut into three pieces so that the second piece is four times four times as long as the first piece and the third piece is five times as long as the first piece. if x represents the length of the first piece, find the lengths of all three pieces.

Find dy/dx using implicit differentiation ln(20+e^xy)=y

What is the equation of a line passing through the point (6,1) and parallel to the line whose equation 3x=2y+4