exam Maths Puzzle Numerical Ability

Hi. Can I have some help finishing this expression?

Find all solutions of the equation and express them in the form a + bi.

x^2 + 7x + 12 = 0

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exam Other Question

If two numbers are opposite of each other, are their reciprocals also opposite of each other? Find the Volume of the Cylinder. Round to the nearest tenth.

(1.5-inches height (4.5-inches radius)
help me find the answer.