The number N, measured in millions of students, enrolled in high school t years after 1965 is given approximately by
?
.
According to this model, in what year (as a date) did high school enroll reach a maximum, and what was the maximum enrollment? Round your answers to two decimal places.
?
A. The maximum enrollment of 13.68 million occurred in 1977.
B. The maximum enrollment of 12.00 million occurred in 1981.00.
C. The maximum enrollment of 13.44 million occurred in 1984.
D. There is no maximum value.
Answer: A
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Find the exact value of the real number y.y = sec-1 
A. 
B. 
C. 
D. 
Solve.A pulsed electric voltage that contains a dc component of 2V is defined by 
where t is time (in ?s). Find a0 (if it is not zero), two nonzero cosine terms (if they exist), and two nonzero sine terms (if they exist) of the Fourier series for the time-dependent voltage.
A. 
- 
B. 2 - 
C. 2 - 
D. 
- 
Solve the problem.A simple exercise machine can be constructed by mounting a stiff spring securely to a wall and attaching a "T" handle to the free end of the spring. The arms can be exercised simply by pulling the "T" handle towards the torso. For a particular spring, the stretch distance is related to the work exerted by the equationx = 
,
where W is the work exerted in joules and x is the stretch distance in cm. How far will you stretch the spring if you exert 673 joules of work? Round your answer to three decimal places.
A. 0.126 cm B. 0.089 cm C. 0.134 cm D. 0.016 cm
Fill in the blank with one of the words listed below.
The horizontal number line in the rectangular coordinate system is called the 
.
A. x-intercept B. y-intercept C. y-axis D. x-axis