5/8 + 3/4 / -2/3- 5/6

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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?

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?