To evaluate -2x+1 for x = -3 substitute x = -3 in the expression and determine the value of -2*(-3) + 1. This is 6 + 1 = 7.

Similarly, the value of 3.5 - 2*x for x = 2.4 is 3.5 - 2*2.4 = -1.3

To evaluate -2x+1 for x = -3 substitute x = -3 in the expression and determine the value of -2*(-3) + 1. This is 6 + 1 = 7.

Similarly, the value of 3.5 - 2*x for x = 2.4 is 3.5 - 2*2.4 = -1.3