What is the value of u?

6.4u-5.1u=-3.25

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u=

It took a skydiver 15 seconds to drop 450 feet. What is the rate (in feet per/second) of the skydiver's drop?

The length of a base of a rectangular prism is twice the width of the base. the height of the prism is 3 times the width of a base. the surface area is 792 square centimeters. what are the dimensions of the prism?

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Simplify the expression (-6+i) / (-5+i)