An earthquake strikes in an isolated area is without food or water. Three crews arrive. One can dispense needed supplies and 35 hours, a second and 70 hours, and a third in 10 hours. How long will it take all three crews working together to dispense food and water?

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

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?

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radii and altitudes is 2: 1? submit