D: because if you take 9.50-7.50=2 you would get p=price or the price of the pen.
Hope I helped=)
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Step-by-step explanation:

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71
so there's a right angle and 19° i added them and got 109°. and remember a triangle is 180° so i did 180-109
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What's the difference between a number track and a number line? A number track is a sequence of numbers, each inside its own square. ... Whereas, a number line is where the numbers are attached to markers on a line. This method of addition / subtraction comes later.