Answer:
0.4%.
Step-by-step explanation:
Given that,
The length of a bolt is 4.75 inches and a machinist makes a bolt that is 4.769 inches long.
We need to find the percent error of the bolt’s length. The percentage error in the any value is given by :

So, the percentage error of the bolt's length is 0.4%.
I'm just going to take a chance and say 1.A, and 2.D.
C 12.5 because you do 7*3.5/2