Answer:
C
Step-by-step explanation:
[tex] composite =cuboid + 3d \: triangle \\ = (l \times w \times h) + ( \frac{1}{2} \times b \times h \times w) \\ = (12 \times 5 \times 7) + ( \frac{1}{2} \times (15 - 12) \times 7\times 5) \\ = (12 \times 5 \times 7) + ( \frac{1}{2} \times 3 \times7 \times 5) \\ [/tex]
