Provide an appropriate response.If log4(x + 6) = 2 - log4 x, then x =
A. 8.
B. -4.
C. 2.
D. 4.
E. 10.
Answer: C
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Solve the problem.A balloon in the shape of a sphere is deflating. Given that t represents the time, in minutes, since it began losing air, the radius of the balloon (in cm) is 
Let the equation V(r) = 
?r3 represent the volume of a sphere of radius r. Find and interpret (V ? r)(t).
A. (V ? r)(t) = 
?(t - 23)3; This is the volume of the balloon (in cm3) as a function of time (in minutes).
B. (V ? r)(t) = 
?(23 - t)3; This is the volume of the balloon (in cm3) as a function of time (in minutes).
C. (V ? r)(t) = 23 - 
?(23 - t)3; This is the volume of the air lost by the balloon (in cm3) as a function of time (in minutes).
D. (V ? r)(t) = 
?(23 - t)3; This is the volume of the air lost by the balloon (in cm3) as a function of time (in minutes).
Simplify.
A. 
B. 
C. -9a6b9
D. 
Solve the problem.The table lists the average composite scores on a national entrance exam for selected years. 
Evaluate f(1991).
A. 130.9 B. 131.7 C. 131.5 D. 130.5
Solve the initial value problem: y? = sin x + 2x; y (0) = 2 .
What will be an ideal response?