(1) That x and 2^{x} have the same first digit

(2) That x and x^{2} have the same first digit

(3) That x^{2} and 2^{x} have the same first digit.

(4) That x, x^{2} and 2^{x} all have the same first digit.

First digit refers to the first non-zero digit of the number written in decimal form.