exam Maths Puzzle Numerical Ability

What are the roots of the equation x^2+9=0 I got x=+-3i,can someone explain?

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exam Other Question

Find the missing value.

Principle= $8200.00, Time= 2.5 years, Simple Interest=$3997.50, Rate=???

Please help

Ellen Okay, only four problems left for my homework assignment and I cannot figure them out (go figure). I am suppose to solve the rational equations, and I can not seem to get the right