exam Maths Puzzle Numerical Ability

Susan needs to find out the surface area of a deck that has one side that is 5.75 feet and another that is 8 feet and another that is 3 feet by 5.75 feet.

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exam Other Question

If the two given equations are being solved so that one unknown is eliminated by the method of comparison, which of the following steps is essential
6x+2y=7
6x-5y=8
A. 6x+4y=14 Solve (5a-4) = a+16/a+1