Can someone help me with this please? I don't know how to do it, and I need the answer asap ;-; (Image Below)

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7

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 axis of symmetry of the function f(x)=-(x+ 9)(x-21)