The last table is linear (1/2, 1, 1.5, 2)
The rational root are x= 7,-3,-6
You can find them by substituting y for 0
I'll give you the answers I'm good at these.
21 = 20
21 explained
twice a number is 60 more than so take 50+50=100
100-60=40
40\20=2
(but use 20)
20 X 5 = 100
