Anna found the difference between thirteen and the product of four and a number. Which expression represents this phrase, and what is its value if n = 3?

The first thing we must do for this case is to define a variable.

We have then:

n: unknown number.

We write the algebraic expression:

13 - 4n

For n = 3 we have:

13 - 4 (3) = 13 - 12 = 1

Answer:

An expression that represents this phrase is:

13 - 4n

its value if n = 3 is:

1