Answer:
following are the solution to the given points:
Step-by-step explanation:
In point a:


calculating unit vector:

the point Q is at a distance h from P(6,6) Here, h=0.1

the value of Q= (5.92928 ,6.07071 )
In point b:
Calculating the directional derivative of
at P in the direction of 



In point C:
Computing the directional derivative using the partial derivatives of f.

Answer:
B 6.00
Step-by-step explanation:
M= 6$
C= 9$
M+C= 6+9= 15$ per hour
Look at it on the Internet