Which of the following expressions cannot be written as an integer? a. square root of 49 b. -3^0 c. 1.2 x 10^2 d. 18/3

All can be written as integers.  Let's go through them.

 because 



(If what was meant was , that's an integer too.)

, an integer

 that an integer too

They're all integers, so NONE OF THE ABOVE