Solve the problem.The bar graph shows the percentage of students at State University that owned portable MP3 players from 2006 through 2012. 
The function f(x) = -0.9x2 + 16x + 10 models the percentage of students that owned portable MP3 players at State University , f(x), x years after 2006.a. Use the function to find the percentage of of students that owned portable MP3 players at State University in 2011. Does this overestimate or underestimate the percentage in the graph? By how much?b. Use the function to determine the first year in which 80% of students owned portable MP3 players at State University.
A. a. 67.5%; underestimates by 1.5%
b. 2015
B. a. 67.5%; overestimates by 1.5%
b. 2014
C. a. 67.5%; overestimates by 1.5%
b. 2015
D. a. 67.5%; underestimates by 1.5%
b. 2014
Answer: D
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?
and 
?
xb = __________ units
?
pb = $ __________
What will be an ideal response?
Find the square root.
A. - 
B. - 
C. 
D. Not a real number
Verify that the values of the variables listed are solutions of the system of equations.
x = 6, y = -2
A. solution B. not a solution
Find the domain of the function.f(x) = log10 
A. (-5, 4) B. (-?, -5) C. (-?, -5) ? (4, ?) D. (4, ?)