Solve the system of equations using the inverse of the coefficient matrix.
A. x = -5, y = 1
B. x = -1, y = 5
C. x = 5, y = -1
D. x = 1, y = -5
Answer: A
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Find the relative extrema of the function and classify each as a maximum or minimum.f(x) = 2 - x2
A. Relative minima: (-
, 0), (
, 0)
B. Relative maximum: (2, 
)
C. Relative maximum: (0, 2)
D. Relative minimum: (0, 2)
Solve the problem.Find the measure of angle x in the triangle.
A. 125° B. 45° C. 85° D. 55°
Solve the problem. Suppose a student plans to drive from his home to New Haven 75 miles on a divided highway and 30 miles on an undivided highway. The speed limit is 70 mph on the divided highway and 50 mph on the undivided highway. Assume the driver drives nonstop. Let T(a) represent the driving time (in hours) if the student drives at a mph above the speed limits. By finding a formula for T(a), determine 
. What does your result mean in terms of the trip?
A. T(0) - T(10) = 0.23; the trip will take 0.23 hours more by driving at 10 mph over the speed limits than it would take driving at the speed limits. B. T(0) - T(10) = 0.37; the trip will take 0.37 hours less by driving at 10 mph over the speed limits than it would take driving at the speed limits. C. T(0) - T(10) = 0.37; the trip will take 0.37 hours more by driving at 10 mph over the speed limits than it would take driving at the speed limits. D. T(0) - T(10) = 0.23; the trip will take 0.23 hours less by driving at 10 mph over the speed limits than it would take driving at the speed limits.
Solve.x3 + 2x2 - 4x ? 8
A. [2, ?) B. [-2, 2] C. (-?, 2] D. (-?, -2] ? [2, ?)