Answer:

Explanation:
First, note the surfaces we have. We have four triangles and one square base. Thus, we can find the surface area of each of them and them add them all up.
First, recall the area of a triangle is
. We have four of them so:
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The base is 5 while the height is 7. Thus, the total surface area of the four triangles are:

We have one more square base. The area of a square is
. The base is 5 so the area is
.
The total surface area is 70+25=95.