Complete the sentence with the best relative pronoun. When we were at the pediatrician's office, we saw Mr. and Mrs. Herrera, we congratulated on the recent birth of their son.

Complete the sentence with the best relative pronoun.

When we were in the pediatrician's office, we saw Mr. and Mrs. Herrera, we congratulated them on their newborn son

Explanation:

you just have to change your newborn

The answer is a + 12

Solution:
In order to solve it, you need to separately solve the numbers that have something in common- for ex: if they are just numbers, or if they have the same exact variables

In order to make it easier, you can rearrange the equation
4a - 3a + 19 - 7
4a - 3a = a
19 - 7 = 12

Since these numbers can't be combined due to the fact that they have nothing in common, you leave the equation as is, resulting in the

a + 12