-28 / 2 could be an answer
<em><u>The equation to find the length r of the red ribbon is:</u></em>

<em><u>Solution:</u></em>
Let "b" be the length of blue ribbon
Let "r" be the length of red ribbon
To find: equation for length r of the red ribbon.
The length of the blue ribbon is two - thirds the length of the red ribbon
Which means,

Therefore,

Thus the equation to find the length r of the red ribbon is found
Point H -3 1/2 should be the answer
21. 2•2=4
24. 3.4•2.4=5.8
27. -1.6•3.6=-5.76
30. 3/1.4=2.1
Hope this helps!