Simplify each sum or difference
(5r^3+8) + (6r^3+3)

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.

Jose is going to use a random number generator 500500 times. each time he uses it, he will get a 1, 2, 3,1,2,3, or 44.

Use sigma notation to represent the following series for 9 terms.