Determine whether a linear or quadratic function would be a more appropriate model for the graphed data. If linear, tell whether the slope should be positive or negative. If quadratic, decide whether the coefficient 
of x2 should be positive or negative. DENTAL FLOSS USE 
Years since 1990
A. Linear; positive
B. Quadratic; positive
C. Linear; negative
D. Quadratic; negative
Answer: D
Mathematics
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The double-line graph shows temperature highs and lows for a week. 
On what day of the week was the difference between the high temperature and the low temperature the least? What was this difference in temperature?
Fill in the blank(s) with the appropriate word(s).
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Find the absolute value.
A. 0
B. 1
C. 
D. 980
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Evaluate the expression using the order of operations.3 ? 7 - 102
A. 490 B. 679 C. 79 D. -79
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Show that the matrix has no inverse.
What will be an ideal response?
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