3.) (t − 4)(t + 3) Multiply. please explain your answer.  

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I'm not sure what the question is, so i'm going to just give you general steps. For these problems use FOIL(first, outer, inner, last)First: multiply the first term from (t − 4) and the t from (t+3).Outer: multiply the two outer term/numbers. so the first term from (t − 4) and the 3 from (t+3) Inner: multiply the two inside terms. The 4 in (t − 4) and the t in (t+3).Last: Multiply the last terms together. The 4 in (t − 4) and the 3 in (t+3)You should add all these up and combine like terms. Hopefully this would give you some hints. Again I'm not sure why (t − 4) came up.