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To make sure a tree does not hit your house when you cut it, you need to know how tall it is. If a yardstick casts a 2 ft. shadow at the same time the tree casts a 30 ft. shadow, how tall is the tree?

The difference of two numbers equals 33. If four times the lesser number is subtracted from three times the greater number, the difference is 62. Find the numbers.

For fireworks that are launched into the air, the formula h = -16t^2 + 200t + 4 models the fireworks' height h, in feet, t seconds after they are launched. When should the fireworks explode so that they go off at the greatest height? What is that height?