1. Given that a vending machine dispenses gumballs in a regularly repeating cycle of ten different colors, if a quarter buys 3 gumballs, what is the minimum amount of money that must be spent before three gumballs of the same color are dispensed?
2. A cylindrical tank with radius 4 feet and hight 9 feet is lying on its side. The tank is filled with water to S depth of 2 feet. What is the volume of the water, in cubic feet?
請幫我解題,我算很久都算不出來,謝謝!