Find all specified roots.Seventh roots of 1.

A. 1, cis , cis , cis , cis , cis , cis 
B. -1, cis , cis , cis , cis , cis , cis 
C. 1, cis , cis , cis , cis , cis , cis 
D. 1, cis , cis , cis , cis , cis , cis , -1


Answer: C

Mathematics

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Solve the inequality. Graph the solution set and write the solution set in set-builder notation.x2 - 4x - 12 < 0

A. {x|-2 < x < 6}


B. {x|x < -2}


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Solve the problem.A motorcycle daredevil is planning a stunt to perform at a county fair. A ramp must be built to give him a 20% grade, or slope. If the vertical height at the end of the ramp must be 12 ft to assure that the stunt is a success, what must be the length of the horizontal run?

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Mathematics