A three-letter word used to show division in a word problem is PER.
When x=-1:

Ok that gives us a little more information.
If we implicitly differentiate with respect to t, from the very start, then we can apply our product rule, ya?

The right side is zero, derivative of a constant is zero.
Where x' is dx/dt and y' is dy/dt.
From here, plug in all the stuff you know:
y' = -3
x = -1
y = 4
and solve for x'.
Hope that helps!
He bought 60 pounds last week and p stands for 60
It would be d because you would subtract 52 from 17 to get the answer then add the number you got to 17 to get 52.