1 and 3 they share a relationship of +2, 3 and 6 share x2, 5 and 8 share +3, 7 and 21 share x3
Answer:
20% i am not 100% sure. if i am wrong, i am sorry
The slope of the line is:(1-(-8))/4-0=9/4
Hey!
RS = 15 and RT = 18. Subtract 18 from 15 to get your answer.

<em>That means your answer is 3</em>
