book Maths Puzzle Numerical Ability

To be a Registered nurse, do you have to know math very well?

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I tried this exponent problem: (-9c2)3 with c=1/3. I got -1. Is this correct?

Also I did (ac)2 with a=2 and c=1/3 and got 4/9. Am I doing it right? Thank you. I am trying really hard to get the hang of exponents. R what expresssion will gives the solutions of {{{x^2 + 2x + 3 = 0}}}