Answer:
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Step-by-step explanation:
By pythagorean theorum we calculate the height:

=
= height of triangle
area of triangle = base * height
area = 
There are two triangles so:

Multiply this by 13.25 to get total cost:
=$259.65
If Nick starts with 20, we can just plug it into p/2 - 12 to get 10-12 or -2. This means Nick did not get 20 cards. Now we have answered both. Two-liner!
Only 6 i believe but idrk