Mr. Karpov has an aquarium that can hold 40 quarts of water. He sells it and buys two new aquariums that can each hold gallons of water. How many more quarts of water do the two new aquariums hold than the old aquarium?

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

In the given figure ar(adf) =ar(cda) and ar(cdf) = ar(cdf). show that abdc and cdfe are trapeziums.

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?