Answer:
200
Step-by-step explanation:
Just took the test on edge.
a
a.b=[-1]
This is a dot product of a and b
a.b =[6,-2,3].[2,5, -1] = [12-10-3] =[-1]
0.125 inches per hour
2.25/18 = 0.125
0.125in per hour