Answer:
n = 20
Step-by-step explanation:
The number of diagonal that can be drawn in a polygon of n sides is given by :

If the number of diagonals are 230, then put D = 230 in above formula. So,

It is a quadratic equation, the value of n is equal to 20.
It means that for 230 diagonal, there are 20 sides of the polygon.
U put 35 on the side to make 5 like that’s. The opposite
E. The 31 red marbles drawn by the student
A. The 100 marbles drawn by the student
31
The answer I came up with was 2.1