Find the sum without the use of a number line.7 + (-7)
A. 0
B. -7
C. 7
D. 14
Answer: A
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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.
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For the consumption function 
, where 
and x are measured in billions of dollars, find the marginal propensity to save when 
.
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A. -$0.213 billion/billion dollars
B. $0.874 billion/billion dollars
C. -$0.85 billion/billion dollars
D. $0.119 billion/billion dollars
Determine the discriminant of the quadratic equation. Use the value of the discriminant to determine whether the quadratic equation has two rational solutions, two irrational solutions, one repeated real solution, or two complex solutions that are not real.1 + 2x2 = -2x
A. Two rational solutions B. One repeated real solution C. Two complex solutions that are not real D. Two irrational solutions
Find the greatest common factor of the numbers.42, 48
A. 90 B. 7 C. 6 D. 3
Solve for the indicated variable. Assume the variable you are solving for must be greater than 0.P = 
, for r
A. r = 
B. r = 
C. r = 
D. r = 