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The answer is C.

Step-by-step explanation:

Fist you take the letter that represents the TOTAL cost for the computer and the fee, which is the letter t. or (t = ) then you take the price, or p and you make it (t = p), and lastly, you add the additional fee, which is 25 dollars. t = p + $25

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.