Answer:
C. 4.2a + 0.8
Step-by-step explanation:
Given:
The two binomials given for addition are:
and 
Now, adding both the binomials, we get:

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

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

Simplifying the above expression, we get:

Therefore, the resulting addition of the given binomials is 
Hence, option C is the correct answer.
Answer: C
<u>Step-by-step explanation:</u>

= 
= 
= 
= 
Volume is Length x width x height. So what are three numbers that multiply to 90?
30x30x30=90
Just to confirm is it x-5/8 or (x-5)/8