A)

B)

C)

D)

You were correct, the exact answer is A. The others do not equal 23 besides that one. Good job!
Answer:
no solution
Step-by-step explanion
there is no solution since the x's cancel out
So he worked 30.5 hours, he just didn't write some of the hours down. To find the hours he didn't write down, you subtract 8+

+

from 30.5, which equals
Answer:
221
Step-by-step explanation:
13 x 17 = 221