Answer:
B
Step-by-step explanation:
Hey There!
To solve this problem we have to combine like terms

So our answer would be
(b)
1-0
—
0-(-7)
Do that, should get you the y:
Answer:
4294967296 Kilograms
Step-by-step explanation:
Great Pyramid has 2^21 blocks
2^21 = 2097152, so
2097152 blocks
Blocks weigh 2^11 each
2^11 - 2048, so
2048 kg per block
2097152(number of blocks) x 2048(weight in kilograms per block) = The Great Pyramid in Egypt weighs 4294967296 Kilograms