11 (11d + 3z + 8), for d = 10 and z = 12

The answer should be 1694.

Explanation:

Why?

start in the parenthesies and break it down from there,

(11d+3z+8)

so start with 11d, with d=10 that would be 110, next with 3z, that would be 36 and you would leave the eight as it is. Adding the three numbers together you get 154.

so now you have 11 (154)

and 11 x 154 = 1694