Question

13. What is the result of adding 5.4a + 7.1 and -1.28 - 6.3?

A. 6.6a + 0.8
B. 6.6 - 0.8
C. 4.2a + 0.8
D. 4.2a - 0.8
What’s the answer

Answer 1

C. 4.2a + 0.8

Explanation:

Given:

The two binomials given for addition are:

`5.4a+7.1` and
`-1.2a-6.3`

Now, adding both the binomials, we get:

`5.4a+7.1+(-1.2a-6.3)`

Distributing the positive sign inside the second binomial, we get:

`5.4a+7.1-1.2a-6.3`

Now, combining like terms using the commutative property of addition, we get:

`(5.4a-1.2a)+(7.1-6.3)`

Simplifying the above expression, we get:

`(5.4-1.2)a+0.8\\4.2a+0.8`

Therefore, the resulting addition of the given binomials is
`4.2a+0.8`

Hence, option C is the correct answer.