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
4 a + b + a = 5 a + b
The expression 4 a + b + a simplifies to 5 a + b by combining the like terms. The correct answer is option C) 5 a + b .
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