Last three, by explaining step by step?

What is the definition of exponential decay?

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

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b