Evaluate 4.68 + 2.7 + 13.289

Use the numbers in the multiplication equation 45 x 1/9 =5 to write a division equation involving division by a fraction.

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?

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25