So i got an answer sheet for this hw but i don't understand how 13 is that answer. can someone explain in english

It's because | -6 | is an absolute number thats why there are two lines on each side... when an absolute number is a negative it is equal to a positive therefore |-6|=6

The lines surrounding the first -6 change it to a positive 6. |-6| = 6 and the opposite of 6 is -6. 13 is correct.

The answer is c because you turn 17.5% into a decimal which gives you .175 then you times that by $361.35 which gives you 63.23625 but then you round that which gives you 63.24. then you at 63.24 pulse 361.35 and you round it which gives you $425

Idon't know the answer