Which of the following is true about the function y = 3 • 2x?

For y = 3 · 2^x, increasing x by 1 gives y = 3 · 2^(x+1) = 2(3 · 2^x), so the value of y doubles. The function’s y-intercept is (0, 3), and at x = 2 it equals 12, so the other statements are false.

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