The formula s= n(a^1+an)/2 gives the partial sum of an arithmetic sequence. What is the formula solved for an

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis.how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

For which pair of functions is (gof)(a)=|a|-2?