Estimate the sum of numbers 9488 and 857 to the nearest 10

Ans: ?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

How many solutions does the nonlinear system of equations graphed bellow have?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?