Which is greater 0.83 or 83/100

What is the difference between regular convex and concave polygons

(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 is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)