D: because if you take 9.50-7.50=2 you would get p=price or the price of the pen.
Hope I helped=)
Step-by-step explanation:
3, -12,7should be the correct answers
The square's diagonal is the triangle's hypotenuse.
the original Pythagorean theorem is

where
a and
b are the two sides and
c is the hypotenuse.
that means the Pythagorean theorem for this question is:

or