Combine like terms.
4a + b + a
a.
4a + 4b
b.
5a + 5b
c.
5a + b
d.
4ab

To combine these terms you would add up the a's and b's.
4a+b+a is the same as 4a+a+b. Anything without a constant in front has a value of 1. You have 4a's and you need to add another a. That equals 5a's. The b is left alone since you can only add like variables.
The answer would be C) 5a +b

D: all real numbers

Step-by-step explanation:

the first inequality is v is less than or equal to -7, and the second equality is v is greater than or equal to -7