Find the least common denominator.
and 
A. 9a2 + 72
B. 9a + 8
C. 9a2 + 8
D. 9a(a + 8)
Answer: D
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Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 3 ; local maximum at x = -3 ; concave up on (0, ?); concave down on (-?, 0) B. Local minimum at x = 3 ; local maximum at x = -3 ; concave down on (0, ?); concave up on (-?, 0) C. Local minimum at x = 3 ; local maximum at x = -3 ; concave up on (-?, -3) and (3, ?); concave down on (-3, 3) D. Local minimum at x = 3 ; local maximum at x = -3 ; concave down on (-?, -3) and (3, ?); concave up on (-3, 3)
Graph the exponential function.y = e-x 
A. 
B. 
C. 
D. 
Solve the given differential equation (where the function is subject to the given conditions) by using Laplace transforms.y" - 16y = 20e5t, y
= 5, y' 
= 0
A. y = 
e-4t + 
e5t
B. y = 
e-4t + 
e5t
C. y = 
e4t + 
e-5t
D. y = 
e-4t + 
e-5t
Find an equation of the tangent line at the given point P.y = 5x2 + x, P(-4, 76)
A. y = 
+ 
B. y = -39x - 80
C. y = - 
+ 
D. y = 13x - 16