Answer:
Option (d) is correct.
 for complete expression  "eight times the difference of a number and three is sixty-four" is written as 8 ( N-3 )= 64
Step-by-step explanation:
    Given expression "eight times the difference of a number and three is sixty-four"
We have to write it mathematically.
Consider the given expression "eight times the difference of a number and three is sixty-four"
Mathematically written as ,
Let the number be N, 
the difference of a number and three is written as N - 3
eight times the difference of a number and three is written as 8( N - 3 ) 
Thus, for complete expression  "eight times the difference of a number and three is sixty-four" is written as 8 ( N-3 )= 64
Thus, Option (d) is correct.