Solve the problem.Students in a math class took a final exam. They took equivalent forms of the exam in monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by 
.Find S'(t).
A. S'(t) = - 
B. S'(t) = 74 - 
C. S'(t) = - 15 ln 
D. S'(t) = 
Answer: A
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Find the particular solution to the given differential equation that satisfies the given conditions.3y" + 19y' + 20y = 0; Dy = 0 and y = 2 when x = 0
A. y = - 
e5x + 
e4x/3
B. y = 
e-5x - 
e-4x/3
C. y = - 
e-5x + 
e-4x/3
D. y = 
e-5x - 
e-4x/3
Find the x-intercepts of the function.g(x) = x2 + 14x + 38
A. ( -14 + 
, 0)
B. (7 - 
, 0), (7 + 
, 0)
C. (7 - 
, 0), ( 7 + 
, 0)
D. (-7 - 
, 0), ( -7 + 
, 0)
Perform the indicated matrix operations.Let C = 
and D = 
. Find C - 2D.
A. 
B. 
C. 
D. 
Solve.A science student watching a group of ants moving along a straight line determines that their position x along the line as a function of time t is given by 
Give an equivalent expression for x by factoring out a common factor.
A. x = t(t3 + 3t2 + 26t) B. x = t(t3 + 3t2 - 13t + 39) C. x = t(t2 + 3t - 26) D. x = t(t2 + 3t + 26)