What fraction is closest to zero? 3/4, 1/3, -3/6, -5/8

Three cylinders have a volume of 2836 cm^3. cylinder a has a height of 900 cm. cylinder b has a height of 225 cm. cylinder c has a height of 100 cm. find the radius of each cylinder. use 3.14 as an approximate for π

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?