How many times larger is 9 × 1013 than 3 × 108?

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?