Write a word phrase for the algebraic expression 3x -7
a. the difference of three times a number x and seven
b. the difference of seven and three times a number x
c. three times a number c fewer than seven
d. the quotient of three times number x and seven

The expression is : 3x-7

First of all, since it is a subtraction, then we are talking about differences between numbers
Then, since we have 3x, then we have 3 times a certain number "x"
After that, since we have 7 removed from the 3x, therefore, we have the difference between three times a number "x" and 7

Based on this, the right choice is "a"