Please refund my $24.00 for a service that I did not use.

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Use the series of plates supplied with your study unit to answer this question: how many two-pole 30-a breakers are installed in panel pp1? a. four b. two c. eight d. nine can i get an answer for this question?

Raul has one solution that is 20% acid by volume and one solution that is 50% acid by volume. he plans to mix together some of each solution to create 30 milliliters of a solution that is 40% acid by volume. how many milliliters of the 20% acid solution should raul use to create the 40% acid solution? can someone explain this to me? i know that the answer is 10 milliliters, but i don't know how to get it.