If a shadow of a tree is 15 feet long. What is the height of the tree in feet

The product of two negative rational numbers is always zero sometimes zero never zero

Xto the second power plus 14x plus 48. what are the factors? we are doing factoring trinomials with a=1

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?