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a lil math quiz. can you do it??

Stevens score on Algebra tests are 91, 89, 86, and 93. What is the minimum score Steven can receive on the fifth test so that the average of the five tests will be 90?

A music system was sold for $318.75 that includes sales tax. If the price of the music system is $300, what is the percentage of the sales tax?

James has 100 meters of a fencing material with him. He wants to construct a rectangle with maximum area using that fence. What would the dimension of that figure be?

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Answer #1

91 6.25% 625 metres squared.

Answer #2

91 6.24%
no clue on the last one

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