If he buys 30 for x amount and sells them for y then you would take y and subtract 30x and your left with the answer = y-30x.
7) 52h because that's how you'd find the distance traveled if there was a number instead of a variable.(d=st)
8)525+3w because you have to add his original total to the amount of cds he will get and if he gets 3 every week that's 3w and then you add them to get the new total.
42. Because you divide into 6 and 7. 6 is divided into 3 and 2. So, 2 times 3 times 7.
Answer:
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