Final answer:
To find out how much money Matthew has left, subtract the amount he spent on the video game from the amount he started with. However, the question lacks complete information about the price of the DVD.
Step-by-step explanation:
To find out how much money Matthew has left, we need to subtract the amount he spent from the amount he started with. If Matthew had $60 and spent $25 on a video game, he would have $60 - $25 = $35 left.
However, the question mentions a DVD purchased for S^(18), which seems to be a typo or incomplete information. To calculate the remaining amount, we need to know the actual price of the DVD.