Simplify.If f(x) = 6
, and g(x) = 
+ 
, find (f ? g)(x).
A. 42
+ 42x
B. 6
+ 7x
C. 6
+ 7x
D. 6
+ 42x
Answer: D
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Solve the problem.The voltage V (in volts) across a resistor in an electric circuit is the product of the resistance and the current. If the current I (in A) varies with time (in s) according to the relation 
and the resistance varies with time according to the relation 
find the time rate of change of the voltage when 
A. 68.46 volts/s B. -0.04 volts/s C. 3.84 volts/s D. 3.88 volts/s
Perform the indicated operation by hand.30.73 - 25
A. 5.83 B. 5.73 C. -5.73 D. 55.73
Solve the problem.Find an equation for the level curve of the function f(x, y) = 
that passes through the point 
.
A. 
= 
B. x = 2y
C. 
? 
D. 
= 2
Simplify the expression. If any variables exist, assume that they are positive.8
- 6m2p
A. 2
B. 14mp2
C. 2m2p
D. Cannot be simplified