Answer:
(b) 30
Explanation:
Given a set of ordered pairs (green, red) = {(2, 6), (3, 9), (5, 15), (6, 18), (10, x)}, you want to know the value of x.
Proportion
The ratio of the red value to the green value is 6/2 = 3 in each case. To keep that ratio, we must have ...
x/10 = 3
x = 30 . . . . . . multiply by 10