What numbers are divisible by 3 and 7?

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

The distance between two cities is 368 miles. if the scale on the map is 1/4 inch=23 miles, what is the distance between the cities on the map?

If it 8 inch candle burns at 7/10 inch per hour and a 6 inch candle burns at 1/5 inch per hour after how many hours would both candles be the same height