Which is the smallest of two numbers whose product is 900 if the sum of the two numbers exceeds their difference by 30

The diameter of a ball is 8 in. what is the volume of the ball? use 3.14 for pi. enter your answer as a decimal in the box. round only your final answer to the nearest hundredth.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827