What is the circumference of the circle when there's a radius of 5

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?

Tyler reads 2/5 of a book on monday, 1/3 of it on tuesday, 2/9 of it on wednesday, and 3/4 of the remainder on thursday. if he still has 14 pages left to read on friday, how many pages are there in the book?

Mia’s gross pay is 2953 her deductions total 724.15 what percent if her gross pay is take-home pay