exam Maths Puzzle Numerical Ability

rationalize the denominator of the fraction.3 sqrt 3 over 3 sqrt 7 i came up with 3 sqrt 147 over 7 but i have no idea if this is correct.thanks in advance for your help .also rewrite 5 sqrt c with a small 2 at the top of the c.for this one i got c 2/5

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exam Other Question
The amount of money A accrued at the end of N years when a certain amount P is invested at a compound annual rate r is given by A=P(1+r)^n IF a person invests $120 at 6% interest Factor Completely
y^2-x^2+2x-1