exam Maths Puzzle Numerical Ability

Choose the correct x + yi form for: 4(cos 240o + i sin 240o)

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exam Other Question

The cost for a long-distance telephone call is $0.36 for the first minutes and $0.21 for each additional minute or portion thereof. Write an inequality representing the number of minutes a person could talk without exceeding $3.00. I am confused on this one. Thanks for the help

Solve using the quadratic formula

5x^2+x=3

Thanks