Tell whether a linear model or a quadratic model is appropriate for the data. If linear, tell whether the slope should be positive or negative. If quadratic, decide whether the leading coefficient a of x2 should be positive or negative.
A. linear; positive
B. quadratic; positive
C. linear; negative
D. quadratic; negative
Answer: B
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Solve for x.
< 9
A. - 
< x < 
B. x < - 
or x > 
C. - 
< x < 
D. x < - 
or x > 
Simplify the given expression.
(
n) + 6(n - 1) + 2(
n) + 6 + n
A. 13n
B. 
n
C. 12n + 1
D. 12n
Use a graphing calculator to plot the data and find the quadratic function of best fit.An engineer collects data showing the speed s of a given car model and its average miles per gallon M. Use a graphing calculator to plot the scatter diagram. What is the quadratic function of best fit?
A. M(s) = 0.063x2 + 0.720x + 5.142 B. M(s) = -0.631x2 + 0.720x + 5.142 C. M(s) = -6.309x2 + 0.720x + 5.142 D. M(s) = -0.0063x2 + 0.720x + 5.142
Find the exact value of y, or state that y is undefined.y = cos-1 
A. 
B. 
C. - 
D. 