Um I think your teacher might be high
34 + 0 + 18 + 26
= (34 + 26) + (0 + 18)
= 60 + 18
= 78
Used:
a + b = b + a - commutative property
0 + a = a - identity property
2,365,*10^6=5,000,000*473
(P.S. 10^6 is 10 to the sixth power)
The answer is A because you are dividing 14 by 7 and then 21 by 7 to get the answer of 23 math problem