A parallelogram has a base of 9 centimeters and a heigh of 21 centimeters. What is the area of the parallelogram?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?