Can somebodygive me a step by step answer for this question?

what is the sum of a 9 term geometric series if the first term is -11 and the common ratio is -4?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Heather is writing a quadratic function that represents a parabola that touches but does not cross the x-axis at x = -6. which function could heather be writing? fx) = x2 + 36x + 12 = x2 - 36x - 12 f(x) = -x + 12x + 36 f(x) = -x? - 12x - 36