Answer:
D. 
Step-by-step explanation:
Firstly, we know it's close to 6.75, so we can compute 6.75*6.75 and the product should be close to whatever's under the
. 6.75*6.75 = 45.5625, so we can already answer.
We could also figure out why other answers are bad.

Answer:
Z=1
Step-by-step explanation:
please mark me as brainlest
Answer:
168
Step-by-step explanation:
Well brake 7 into 5 and 2 and then just multiply it by 3 so it would be 5 x3=15 and 2x3=6 then u add 15+6 it would be the sum, of 21 so 3x7=21