If i add 9 to my number, i get six what is my number?

The quadratic function h(t)=-16.1t^2+150 choose the graph representation

What does the sign of the slope tell you about a line?

Ireally need subtract and simplify.(-y^2 – 4y - 8) – (-4y^2 – 6y + 3)show your work, ! i will mark you brainliest but you have to show your work.