9514 1404 393
Answer:
x = 3
Step-by-step explanation:
Maybe you want the solution ...
Suppose the width is w
Then the length will be w+4
Perimeter will be 2 (length + width) = 2 (w + w + 4 ) = 60
Solve this for w. Knowing w you can find the length and width.
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If a and b represent the height and base of the triangular face, and h represents the length of its hypotenuse, and w represents the width or thickness of the prism, the surface area (A) is
.. A = ab +w*(a +b+ h)
Of course the area of each triangle is (1/2)ab, but there are two of them, so their total area is ab.
Put in the numbers and do the arithmetic. If you have a lot of them all specified in this way, a spreadsheet can make short work of it.
A = 5*12 +4*(5 +12 +13) = 160 . . . square inches