Answer:
6. 126.514 cm
7. 156.486 g
8. 41.17 g
Explanation:
For #6, simply add all three numbers together and it will equal 126.514 cm.
Similar applies for #7, when you subtract the two numbers, it will equal 156.486 g.
Same for #8, add together the answers and you get 41.17 g, which is choice A. Hope it helps!