exam Maths Puzzle Numerical Ability

write the number in standard complex form
20- sqrt of -8

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exam Other Question

A measuring tape drops from a roof that is 16 feet above the ground. After how many seconds does the measuring tape land on the ground?

How would you write the equation? For what value(s) of n is x^2-3x+2 a factor of x^4+2x^3-9x^2-2x+n?