exam Maths Puzzle Numerical Ability

"plot all the complex numbers in the complex plane whose absolute value is 4. "

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exam Other Question

Graph each of the following equations, using the intercept method. See Example 7 (p 534) in the text for reference.
28) 2x + 3y = 6
solve using the quadratics formula

rSQUARED+16r+21=0