I have no idea how to do this. Only only I know is the problem given as well as the equation. The downpayment is cost minus principal, but I'm not sure how? I'm having a brain fart moment, so I would appreciate the help!

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Step-by-step explanation:

if x = 1, then the answer is 3.5

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.