exam Maths Puzzle Numerical Ability

The set of positive real numbers is closed under which operation(s)? Select all that apply.

a. Addition
b. Division
c. Multiplication
d. Subtraction

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exam Other Question

CAROL MILLER WENT TO EUROPE AND FORGOT TO PAY HER $740 MORTGAGE PAYMEONT ON HER NEW HAMPSHIRE SKI HOUSE. FR HER 59 DAYS OVERDUE ON HER PAYMENT, THE BANK CHARGED HER A PENALTY OF $ divide and simplify
[sq.rt. of (72x^2)] / [sq.rt of 2x]