D: a rectangle hope this helps
Answer:
40 marbles
Step-by-step explanation:
because for every one blue marble there are two white marbels so if u time 2 by 20 it's 40
N^2 + n - 120 = 0
Quadratic formula
a = 1, b = 1, c = -120
n = [-1 plus or minus root(1^2 - 4(1)(-120))] / 2(1)
n = (-1 plus or minus root481)/2
n =(approximately) 10.5 or -11.5
11.9 would be the correct answer I believe
