Answer:
Blue and green beads make up 5/9 of the necklace.
Step-by-step explanation:
To find this, add the two fractions together.
1/3 + 4/18
But make sure to give common denominators first
6/18 + 4/18
10/18
And simplify by dividing both by 2.
5/9
If r = 20, then plug 20 into the equation.
so instead of r - 9, it's 20 - 9
20 - 9 = 11
24.8 millimeters