Find all the first order partial derivatives for the following function.f(x, y) = 6x - 3y2 - 9
A. 
= -6y; 
= 6
B. 
= -3; 
= -6y - 9
C. 
= 6x; 
= -6y
D. 
= 6; 
= -6y
Answer: D
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to find the value of the other indicated hyperbolic function.cosh x = 
, x < 0, coth x =
A. 
B. - 
C. - 
D. - 
Find a formula for the inverse of the function described below.An organization determines that the cost per person of chartering a bus is given by the formula 
where x is the number of people in the group and C(x) is in dollars.
A. C-1(x) = 
B. C-1(x) = 
C. C-1(x) = 
D. C-1(x) = 
Residential customers who heat their homes with natural gas have their monthly bills calculated by adding a base service charge of $5.48 per month and an energy charge of 48.59 cents per hundred cubic feet. Write an equation for the monthly charge y (in dollars) in terms of x, the number of hundreds of cubic feet used. ?
A. 
B. 
C. 
D. 
E. 
Find all the critical numbers of the function.y = x1/5 - x6/5
A. 
B. 
C. - 
, 0
D. 0, 