What is the mean of this data set? {10, 15, 12, 6, 2}

I’m stuck on this i don’t understand.

Write the sentence as an equation. 6 fewer than the quantity 140 times j equals 104

Apolynomial function has a root of –6 with multiplicity 1, a root of –2 with multiplicity 3, a root of 0 with multiplicity 2, and a root of 4 with multiplicity 3. if the function has a positive leading coefficient and is of odd degree, which statement about the graph is true?