<prompt> Evaluate the expression 2x7 for x2.  <response>: The expression 2x 7 can be evaluated for x2 as follows: First, substitute the value of x which is 2 into the expression: 2x 7 2 2 7 Then, solve the expression: 4 7 11 So, when x 2, the value of the expression 2x 7 is 11. 