Provide an appropriate response.Why does the horizontal line test (checking if a function is one-to-one) work?
What will be an ideal response?
Answers may vary. One possibility: any two points that lie on the same horizontal line have the same y-coordinate. Thus, if any horizontal line intersects the graph of the function more than once, this would indicate that two different x-coordinates correspond to the same y-coordinate (and thus two ordered pairs have the same y-coordinate). Such a function cannot be one-to-one. However, if no two ordered pairs have the same y-coordinate, then the function is one-to-one.
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Make the indicated conversion. 396 cm2 to in.2
A. 156 in.2 B. 1010 in.2 C. 61.4 in.2 D. 2550 in.2
Work the chain multiplication.(20)(10)(100)
A. 19,900 B. 19,800 C. 20,100 D. 20,000
The bar graph shows the expenditures of one city government in a recent year. 
Name the agency with the largest spending and estimate this value.
A. Environment; $3.2 million B. Human Resources; $24.2 million C. Health; $5.4 million D. Pensions; $13.4 million
Find the quotient.-80 ÷ (-4)
A. 20
B. -20
C. 
D. 10