Evaluate the expression 7+4b when b = 3

We can substitute 4b with 12, because 4 * 3 = 12. 4b is the same as 4 different b's, and when we know b is 3, we can multiply 4 by 3 to get 12.

7 + 4b =

7 + 4 * 3 =

7 + 12 =

19.

7 + 4b when b = 3 is 19.

19

Step-by-step explanation:

Since we know the value of b we can add it into the equation

1. 7+4 (3)

Now we can simplify, lets start with multiplication

2. 7+12

Finally, simplify

3. 7+12 = 19