Evaluate the expression.4 ? 8 - 4
A. 28
B. 16
C. 128
D. 36
Answer: A
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Factor completely.x4 - 625
A. (x2 - 25)(x + 5)(x - 5) B. (x2 + 25)(x + 5)(x - 5) C. Prime D. (x + 5)2(x - 5)2
Suppose 
measures an economy's personal consumption expenditure and x the personal income, both in billions of dollars. Then, 
measures the economy's savings corresponding to an income of x billion dollars. Then
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?
The quantity dS/dx is called the marginal propensity to save.
?
For the consumption function 
, where 
and x are measured in billions of dollars, find the marginal propensity to save when 
.
?
A. -$0.213 billion/billion dollars
B. $0.874 billion/billion dollars
C. -$0.85 billion/billion dollars
D. $0.119 billion/billion dollars
Find the indicated nth term of the geometric sequence.
?
7th term : 
?
A. 
B. 
C. 
D. 
E. 
Write the equation of the line tangent to the graph of 
at 
.
?
A. 
B. 
C. 
D. 
E. 