exam Maths Puzzle Numerical Ability

A rectangular garden has width of x and a perimeter of 200 feet. Find x so that the area of the garden is maximized.

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exam Other Question

Janet invested $29,000, part at 12% and part at 14%. If the total interest at the end of the year is $3,800, how much did she invest at 12%?

I am having a terrible time setting up this problem... Solve each absolute value equation:

4-3|x - 2|= -8