Solve the problem.The rate at which an assembly line worker's efficiency E (expressed as a percent) changes with respect to time t is given by 
where t is the number of hours since the worker's shift began. Assuming that 
find E(t).
A. E(t) = 55t - 4t2 + 147
B. E(t) = 55t - 8t2 + 45
C. E(t) = 55t - 4t2 + 96
D. E(t) = 55t - 4t2 + 45
Answer: D
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Solve the problem.Find an ordered pair that satisfies the equation x + y = 1 by letting y = 0.
A. (1, 0) B. (6, 4) C. (0, 1) D. (0, 0)
Solve the problem.A weight attached to a spring is pulled down 5 inches below the equilibrium position. Assuming that the period of the system is 
sec, what is the frequency of the system?
A. 
cycles per sec
B. 6 cycles per sec
C. 
cycles per sec
D. 3 cycles per sec
Evaluate the sum using the given information.x1 = -2, x2 = -4, x3 = 2, x4 = 0, and?x = 0.6; f(x) = x2 - 4
A. 19.2 B. 5.8 C. 4.8 D. 0.192
Find the unknowns on the right side of the partial fraction decomposition.
= 
+ 
+ 
A. A = 
, B = - 
, C = 1
B. A = 
, B = 1, C = - 
C. A = - 
, B = 
, C = 1
D. A = - 
, B = 1, C = 