+15 
k, so I Ok, so I filled in the table easily t: -3, -2, -1, 0, 1, 2
x: -11 -8 -5 -2 1 4
y: 19 15 11 7 3 -1
But I don't know what the delta means! Any hints? Thanks!
+36916 Delta usually means ' change in'
as in change in x per change in t change in t would be from -3 to 2 so delta t would be 5
then do the same for the coresponding values you found for x
then just do the math delta x divided by delta t
