Answer:
surface area of rectangular prism :
2 ( length * width + length * height + width * height )
2 ( 15 * 10 + 15 * 3 + 10 * 3 )
2 ( 225 )
450 in²
volume of triangular prism :
( base * height * length ) ÷ 2
( 7 * 4 * 8.5 ) ÷ 2
119 ft³
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