exam Maths Puzzle Numerical Ability

Hi Can I have some help with this problem?

Write an equation that expresses the statement. Use k as the constant of variation.
S is directly proportional to the square root of r and is directly proportional to the square of t.

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exam Other Question

Here is the problem. PLEASE help if you can!

7^x-2/6=√7

√7= square root of 7
THE ASSET OF HAL'S PLACE ARE CURRENTLY VALUED AT $325,000. THE ASSETS ARE EXPECTED TO BE WORTH EITHER $280,000 OR $360,000 ONE YEAR FROM NOW. THE COMPANY HAS A PURE DISCOUNT OUTSTA