Solve.A mathematical model for the average of a group of people learning to type is given by 
where N(t) is the number of words per minute typed after t hours of instruction and practice 
per day, 5 days per week). What is the rate of learning after 50 hours of instruction and practice?
A. 0.15 words per minute typed per hour of instruction and practice
B. 0.5 words per minute typed per hour of instruction and practice
C. 0.12 words per minute typed per hour of instruction and practice
D. 0.1 words per minute typed per hour of instruction and practice
Answer: C
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Graph the parabola or ellipse. Include the directrix that corresponds to the focus at the origin.r = 
A. 
B. 
C. 
D. 
Solve the problem.At a fixed temperature, the resistance R of a wire varies directly as the length l and inversely as the square of its diameter d. If the resistance is 1.25 ohm when the diameter is 1 mm and the length is 250 cm, what is the resistance when the diameter is 2 mm and the length is 720 cm?
A. 225 ohm B. 0.9 ohm C. 1.8 ohm D. 180 ohm
Solve the problem.A(x) = -0.015x3 + 1.05x gives the alcohol level in an average person's bloodstream x hours after drinking 8 oz of 100-proof whiskey. If the level exceeds 1.5 units, a person is legally drunk. Would a person be drunk after 6 hours?
A. Yes B. No
Find the limit algebraically.lim (x - 
)(x + 
)x?0
A. -5 B. 0 C. 5 D. does not exist