What is the surface area of a cone when the slant height is 6 mm and the diameter is 4 mm? a. 12 mm2 b. 24 mm2 c. 31.4 mm2 d. 50.24 mm2

What is 140% of 25? because i need

(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.

Solve for x where 0 equation: cot^2x+2cotx+1=0