Find the derivative.y = 
+ 4 sec x
A. y ' = - 
+ 4 tan2x
B. y ' = - 
- 4 csc x
C. y ' = - 
+ 4 sec x tan x
D. y ' = 
- 4 sec x tan x
Answer: C
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Perform the indicated operations. Write the answer using only positive exponents. Assume that all variables represent positive real numbers.
A. - 7k11
B. - 
C. 
D. 
Solve the problem.The time of a telephone call (in minutes) to a certain town is a continuous random variable with a probability density function defined by 
for 
Find the probability that the call lasts between 1 and 3 minutes.
A. 1.0014 B. 0.0014 C. 0.8736 D. 0.9986
Solve the equation.3(6 - 3x) = 
A. 9
B. 
C. 3
D. -3
Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation.3x + y - 2z - w = -10 -x + 4y + z - 4w = -10 4x - 2y + 3z + w = -10 -2x - y - z - 4w = 5
A. (-1, -3, -2, 3) B. (-3, 2, 1, -1) C. (-3, -2, -1, 1) D. No solution