Describe how trigonometric equations differ from trigonometric identities

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

Find the value of x. round the length to the nearest tenth