Help me Mount St. Helens lost about 1300 feet of height in the May 18, 1980, volcanic eruption.
About how many meters of height did it lose?
A. about 3900 meters
B. about 39 meters
c. about 3.900 meters
D. about 400 meters
E. about 40 meters

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Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?