You plan on using cost-based pricing. The cost of your product is $10, and you are planning a 30% mark-up. What should the price
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Answer: Choice A) 15 feet
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x = length of fourth side in quadrilateral ABCD
Have a look at the attached image I've posted. I made a chart that lines up the side lengths from largest to smallest. Note how the first two items in the bottom row are blank. We don't know these values and we don't need to find out in order to find x.
Based on the last two columns of that table, we can form the proportion below, which is then used to isolate x.
30/12 = x/6
30*6 = 12*x ... cross multiply
180 = 12*x
12*x = 180
x = 180/12 ... divide both sides by 12
x = 15
Write the equations: 
Substitute for h:
Solve for s:
There were 280 downloads of the standard version. There were 1120 downloads of the high-quality version.
Substitute for h:
Solve for s:
There were 280 downloads of the standard version. There were 1120 downloads of the high-quality version.