book Maths Puzzle Numerical Ability

I am having trouble with this question, Find the Lowest Common Denominator of

3 7
---- and ------
x^3 xy^4

I think the answer is

xy^4

Am I right, Can someone let me know?

Read Solution (Total 0)

book Other Question
2)(sqrtx)^2=x Is an identity (true for all nonnegative values of x)?
Answer:
Explain your answer in this space. (n+2 divided by 2) + (n+1 divided 6)