I need someone to check this
posted by Jennifer .
Add and Simplify: 100x/x+10 + x^3/x+10
I have the answer as X^3+100x/X+10 is this correct?

Are the x+10 terms in denominators? If so, you should have put parentheses around them.
If that is the case, then yes,
(x^3 +100x)/(x+10) is the answer.
It can also be written
x(x^2+100)/(x+10)
If that were a (x^2100) in the numerator, you could simplify it even more by factoring.