-20b over 3a dot 15a^3 over 5b

Assuming you mean the following:

. . . . .[(-20b) / (3a)] × [(15a^3) / (5b)}

...what are you supposed to do with this? Didn't they give you any instructions?

When you reply, please include a clear listing of everything you have tried so far. Thank you.

Eliz.
 
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