Solve. Write a mixed numeral for the answer.A road acceleration test measures the time in seconds required to go from 0 mph to 60 mph. The results for five cars were as follows: 6
sec, 7
sec, 8
sec, 6
sec, and 7
sec. What was the average time?
A. 7
sec
B. 7
sec
C. 7
sec
D. 7
sec
Answer: C
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True or false?The perpendicular bisectors of a triangle are always concurrent.
A. True B. False
Determine the domain and range of the function. Then graph it.f(x) = 
A. domain = [0, ?), range = [5, ?)
B. domain = [-5, ?), range = [0, ?)
C. domain = [5, ?), range = [0, ?)
D. domain = [0, ?), range = [-5, ?)
Use a graphing calculator to solve the system of equations. Round your solutions to one decimal place.2.2x + 2.1y - 4.1z = 1.54.0x - 6.8y + 1.2z = -3.03.8x + 4.0y + 4.0z = 10.9
A. (1.9, 2.2, 1.4) B. (0.9, 1.1, 0.7) C. (3.8, 4.5, 2.8) D. (0.5, 0.6, 0.4)
Find all relative extrema for the function, and then match the equation to its graph.
z = -x4 + y4 + 2x2 - 2y2 + 
A. Relative maxima of 
at (1, 1) and
at (-1, -1); saddle point at (0, 0)
B. Relative maxima of 
at (-1, 1) and
at (1, 1)
C. Relative minima of - 
at (0, 1) and
at (0, -1); saddle point at (0, 0)
D. Saddle points at (0, 0), (-1, 1), (1, -1), (1, 1),
and (-1, -1)