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Answer:
x = 8.48074
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Excuse me but his answer is incorrect. To find the proper rate of change you might have to solve it like you would for slope.
First you would find the points for x = 3 and x = 15 would be (3, 0.08) and (15, 327.68). Then using the slope formula you can find 327.60/ 12. That gives 27.3. So in that case the correct answer is C.
To find the answer, all we need to do is plug in the slope and point they gave us into the Point Slope Formula!
The point slope formula is ...

So lets put them in!
y - 4 = 2/3 (x - (-3))
Tip: remember when you subtract a negative number, it turns into adding !
So our final answer is probably D (I think you may have put a <u>typo</u>)

X=60 Y=33.333~ Z= 80 (I’m pretty sure this is right, but I’m not sure if this is what you wanted/needed) hope this helped^-^