If y is directly proportional to x and if y = 20 when x = 6, what is the value of y when x = 9 ?
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It's obviously none of the above because the true area will have a square root of 3 in it because of the equilateral triangle. They want us to find the approximate area. When I was in school the difference between an approximation and the exact answer was greatly stressed but that seems to be fading of late.
That's a rectangle less an equilateral triangle. The area of an equilateral triangle is which is easily derived but I won't bother here.
Answer: b