exam Maths Puzzle Numerical Ability

Choose the correct x + yi form for: 2(cos 120o + i sin 120o)

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Business and finance. The electricity costs of a business decreased from $12,000 one year to $10,920 the next. What is the rate of decrease? Write the equation of each hyperbola in standard form.

4. 25x2- 4y2 + 100x + 24y - 36 =0

Then I added 36 to both sides.

4. 25x2 - 4y2 + 100x + 24y = -36

That's as far a