ZC and ZD are vertical angles. mZC = rº and mZD= (-3x + 80)°.
What is mZC?
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Need on this one asap im almost done with this subject

(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.

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters