Solve the problem.A manufacturer sells telephones with cost function 
, 0 ? x ? 1000 and revenue function 
, 0 ? x ? 1000. Determine the interval(s) on which the profit function is increasing.
A. (50, 850)
B. (900, 1000)
C. (0, 7900)
D. (0, 900)
Answer: D
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Find the mode of these values:2, 2, 6, 6, 2, 4, 6, 2
A. 2 B. 3 C. 4 D. 6 E. 1
Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation. x + 3y = -8 14x + 4y = 2
A. {(1, -3)} B. {(3, -1)} C. {(-3, 1)} D. {(-1, 3)}
Solve the equation in the real number system.3x3 - x2 - 18x + 6 = 0
A. 
B. 
C. { -3, 
, - 
}
D. { 3, 
, -
}
Solve the problem.A ball is kicked upward with an initial velocity of 32 feet per second. The ball's height, h (in feet), from the ground is modeled by 
where t is measured in seconds. How much time does the ball take to reach its highest point? What is its height at this point?
A. 2 sec; 48 ft B. 1 sec; 32 ft C. 2 sec; 16 ft D. 1 sec; 16 ft