One solution to a quadratic equation is x equals start fraction negative nine plus 21 i over three end fraction full stop what is the solution in simplified standard form, x = a + bi, if a and b are real numbers?

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When the ball has traveled a distance of

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.