exam Maths Puzzle Numerical Ability

Simplify. Use only positive exponents.
3xy^5/x^-4y^-3=?

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exam Other Question

Where are you looking if the indices i and j are equal in a square matrix?

a. Along the middle row
b. Along the middle column
c. Along the diagonal from the upper left to the
Write the domain of the ration function in interval notation.

F(x)= 1/x-10

I just dont understand how they want me to express it.