Please help me po with solution sana

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

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

Solve for x and select the correct answer