Solve the problem.P(x) = -x3 + 
x2 - 60x + 100, x ? 5 is an approximation of the total profit (in thousands of dollars) from the sale of x hundred thousand tires. Find the number of hundred thousands of tires that must be sold to maximize profit.
A. 5 hundred thousand
B. 5.5 hundred thousand
C. 4 hundred thousand
D. 4.5 hundred thousand
Answer: A
Mathematics
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Find the torsion of the space curve.r(t) = (6t sin t + 6 cos t)i + (6t cos t) - 6 sin t)j - 6k
A. ? = 0 B. ? = 1 C. Undefined D. ? = -1
Mathematics
Solve the problem.Find the distance in kilometers between the cities whose latitudes are given. Assume that the cities are on a north-south line and that the radius of the earth is 6400 km. City A, 51°N and city B, 6°N
A. 5084 km B. 5033 km C. 4976 km D. 5027 km
Mathematics
Solve over the interval [0, 2?).f(x) = cos2 x - sin2 x - 1, f(x) > 0
A. 
? 
? 
B. [0, 2?)
C. ?
D. (0, ?) ? (?, 2?)
Mathematics
Evaluate the expression.tan-1 
A. 0
B. - 
C. - 
D. undefined
Mathematics