How do i get the answer for 8 - (-6) i’m not good at math sorry

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

What is the solution to the division problem below x3+x2-11x+4/x+4

How do i i solve this equation? -18 = x/3 + 3