80:56 because starting with 136 you subtract 56 and get 80. so therefore 80 is the number of songs he kept. the question also tells you that 56 is the number of songs deleted.
The answer is A: 1 coil in a spring that is 7 inches long
i am not sure so correct me if i am wrong
hope this helps
Finding the difference is the same as subtracting the smaller from the larger
So he has $20 total
Friday: 20 - 4.58 = $15.42 left
Saturday: 15.42 - 7.43 = $7.99 left
Sunday: 7.99 - 3.50 = $4.49 left
He has $4.49 left.