exam Maths Puzzle Numerical Ability

The set of positive real numbers is closed under which operation(s)?
is it multiplication
HELP!

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exam Other Question

3log(X^2)-4log(X^2)+log(2X^3) The formula for calculating the amount of money returned for an initial deposit money into a bank account or CD (Certificate of Deposit) is given by A=P(1+r/n)nt

A is the amoun