Answer:

Step-by-step explanation:
Start with:

Combine like terms:

Answer: Um... Not quite sure what you're asking, but he bought about 5 games with the gift card.
Answer:

Step-by-step explanation:
(r⁻⁷)⁶ = r⁽⁻⁷⁾ˣ⁶
= (r)⁻⁴²
Isolate the variable by dividing each side by factors that don't contain the variable.
For the cylinder on the left-hand-side,

now, for the triangular prism on the right-hand-side,
notice is really just 2 triangles and 3 rectangles, stacked up to each other at the edges.
the triangles have a base of 4, and a height of 1.5.
the rectangle on the left and the one on the right is a 6x2.5 rectangle.
the rectangle at the bottom, is a 4x6 rectangle.
adding their areas, is the area of the prism,