What is 300,000,0000 times 500,000,0000

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

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

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