Use the maximum/minimum finder on a graphing calculator to determine the approximate location of all local extrema.f(x) = x4 - 3x3- 21x2 + 74x + 19
A. Approximate local maximum at 1.555; approximate local minima at -2.999 and 3.721
B. Approximate local maximum at 1.648; approximate local minima at -3.069 and 3.781
C. Approximate local maximum at 1.681; approximate local minima at -3.16 and 3.692
D. Approximate local maximum at 1.604; approximate local minima at -3.089 and 3.735
Answer: D
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Determine whether the ordered pair is a solution of the system.(4, 6) 
A. Yes B. No
There are 3 solutions of 
. Find all three solutions. Round your answers to two decimal places if necessary.
?
A. 3.14, 2.72, -3.14 B. 0, 3.24, -1.24 C. 0, 4, -1.72 D. 0, 1, -1
Provide an appropriate response.Solve the fractional equation, identifying excluded values if any.
x + 
x = 
A. 
B. 1
C. 1
, x ? 2
D. 
, x ? 0
Solve.A car travels 400 miles on level terrain in the same amount of time it travels 160 miles on mountainous terrain. If the rate of the car is 30 miles per hour less in the mountains than on level ground, find its rate in the mountains.
A. 20 mph B. 50 mph C. 40 mph D. 80 mph