help please!! i have 20 minutes left to do this and I don't get the rest :( please answer the 3 of them !!

Answer:
1st question answer is 10cm2
2nd question answer is 1368 in2
3rd question answer is 45 in2
Step-by-step explanation:
1st question explanation is 16+ 24 = 40
2nd question explanation is 19 x 8 x 9 = 1368
3rd question explanation is 8 x 2 1/4 x 2 1/2 = 45
DON'T COMPLAIN IF WRONG!
Answer:
5) 40 square cm
6) 1368 cube in
7) 50 cube in
Step-by-step explanation:
ill explain later if you want me to :)