Answer:
A
Step-by-step explanation:
The addition of the polynomial
with
is
.
What is a polynomial?
⇒ A polynomial is an expression consisting of indeterminates and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponentiation of variables.
⇒ In the addition of polynomials, the like terms are added while in subtraction, the like terms are subtracted.
Calculation;
We have been given two polynomial which we have to add
and 
The sign after addition or subtraction will always be of the variable having more value.

On adding like terms with each other
⇒ 
⇒ 
Hence the addition of the polynomial
and
is
.
Learn more about polynomial here :
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45/100 is 4,500%
2/5 is 40%
18/40 is 45%
15/25 is 60%
Answer:
A
Step-by-step explanation:
A: The student incorrectly divided both sides by 35. The student should first add 10 to both sides, obtaining 35x = 15, and then divide 15 by 35, obtaining the final answer 3/7.