Can someone answer the last question

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?

I'm confused on this could anyone me and show me what i need to do to solve it.

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