Actually, the answer is not A, if you're saying A is the first choice above. That's incorrect. You will need to use the Geometric mean for right triangles here to figure out what the value of a is. We will use this form: 
. We have a value for YZ of 3; side a is XZ. That means in order to solve this we need WZ, which we can find using pythagorean's theorem. 3^2 + 4^2 = c^2 and 9 + 16 = c^2 and c = 5. Now we fill in accordingly: 
. Cross-multiply to get 3XZ=25 and side XZ is 
. XZ is 25/3 and YZ is 3, so 25/3 - 3 = XY. That means that XY (side a) = 16/3 or 5 1/3, choice B, or the second one down.
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The rectangular fence will have length x and width y, and we know that the distance around, the perimeter (2x+2y), should not exceed 380 ft. We also know that the length should be at least 110 ft, so x=110.
Now we can set up our inequality:
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| | y
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x
The rectangular fence will have length x and width y, and we know that the distance around, the perimeter (2x+2y), should not exceed 380 ft. We also know that the length should be at least 110 ft, so x=110.
Now we can set up our inequality: