the answer is 671,000,000
6.71 x 10^8 converted to standard form is equal to 671,000,000.
Hope it helps:)
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I multiplied by root of 65 to rationalize, you can leave answer as 7/root of 65
It is possible to have a triangle with those lengths
3/4 foot is 9 inches, and 4 1/2 feet is 54 inches, so, 54/9 makes exactly 6 pieces of string.