exam Maths Puzzle Numerical Ability

Write in trig form: -6 + 6sqrt3i

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exam Other Question

When Sharon sold a vacuum cleaner for $220, she received a commission of $17.60. What was the rate of commission? Elisha invested $12,000 for one year, part at 3% and part at 4 3/4%. If she earned $438.40 in interest, how much was invested at each rate?