EXPERT HELP I'LL GIVE BRAINLIEST: EXPLAIN THE ANSWER PLEASE

Answer: 109 cm^3
Step-by-step explanation:
4 x 7 = 28
28/2 = 14 cm^3
4 x 4 = 16 cm^3
4 x 15 = 60
60/2 = 30 cm^3
4 x 7 = 28 cm^3
7 x 6 = 42
42/2 = 21 cm^3
Add all together = 109 cm^3