exam Maths Puzzle Numerical Ability

Evaluate the expression and write the result in the form a + bi.

sqrt(1/3)sqrt(-27)

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exam Other Question

Solving inequalities with two variables

I need an example of this and a way to solve it.
thank you Combine like terms

3x - 6x2 + 2 - 4x2 + 7x - 1 - 8 + 3x2