Solve the problem.It costs $40 per hour plus a flat fee of $16 for a plumber to make a house call. What is an equation of the form 
for this situation?
A. y = 40x
B. y = 16x
C. y = 40x + 16
D. y = 16x + 40
Answer: C
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Transform the equation to a form without an xy-term by a rotation of axes. Graph the curve.x2 + xy + y2 - 3y - 6 = 0
A. 
B. 
C. 
D. 
Let C be a smooth curve defined by r(t) = 7i+tj+4tk, and let T(t) and N(t0 be the unit tangent vector and unit normal vector to C corresponding to t. The plane determined by T and N is called the osculating plane. Find an equation of the osculating plane of the curve described by r(t) at t =1.
What will be an ideal response?
For an arc length s, area of sector A, and a central angle ? of a circle of radius r, find the indicated quantity.r = 81.6 cm, ? = 
radians, find A
A. 417 cm2 B. 16.1 cm2 C. 2,620 cm2 D. 1,310 cm2
Find the derivative of the function.
?
What will be an ideal response?