Provide an appropriate response.Solve for x: 1 - 4x - 4x2 = 0
A. 
B. 2 ± 2
C. -2 ± 2
D. 
± 
E. - 
± 
Answer: E
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A value of sinh x or cosh x is given. Use the definitions and the identity 
to find the value of the other indicated hyperbolic function.sinh x = - 
, coth x =
A. 
B. - 
C. - 
D. 
Answer the question(s) based on the following situation: A dishonest coin (landing heads 
of the time) is tossed 1350 times. The random variable X denotes the total number of heads that come up in the 1350 tosses.The standard deviation ? of this approximately normal distribution X is approximately
A. 18.37. B. 20. C. 18. D. 18.63. E. none of these
Rationalize the denominator. Assume that all variables represent positive real numbers.
A. 
B. 5
C. 
D. 5
Solve the system of equations using matrices (row operations). If the system has no solution, say that it is inconsistent.
A. x = 4, y = -3, z = -5, w = 2; (4, -3, -5, 2)
B. x = - 
, y = 
, z = 
, w = - 
; 
C. x = 
, y = - 
, z = - 
, w = 
; 
D. x = -4, y = 3, z = 5, w = -2; (-4, 3, 5, -2)