I think it would be y plus 3 times 2 equals 5x. I'm not sure if that is what they are asking for.
Answer:
30 inches
Step-by-step explanation:
Assuming the lengths are measured when B lies between A and C on a line, the segment addition theorem applies:
AC = AB +BC
42 = AB + 12 . . . . . fill in the given numbers
30 = AB . . . . . . . . . subtract 12
The length of AB is 30 inches.
Since work = force * distance, the answer would 5*.5, which is 2.5 J
7^4 the ^ is the exponent symbol if you did not know
7^4=2,401