Find the mean of the random variable x associated with the probability density function over the indicated interval.
?
; 
?
A. ?
B. ?
C. ?
D. ?
E. 
Answer: E
Mathematics
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Solve the problem.An auditorium has 20 rows with 10 seats in the first row, 12 in the second row, 14 in the third row, and so forth. How many seats are in the auditorium?
A. 620 seats B. 400 seats C. 390 seats D. 580 seats
Mathematics
Provide an appropriate response.The curves y = ax2 + b and y = 2x2 + cx have a common tangent line at the point (-1, 0). Find a, b, and c.
A. a - 2, b = 1, c = -1 B. a = 1, b = -1, c = 2 C. a = -1, b = 1, c = -2 D. a = 1, b = 0, c = 2
Mathematics
Find the diameter of a circle if the radius has the value given.r = 45 cm
A. 22.5 cm B. 90 cm C. 6358.50 cm D. 141.3 cm
Mathematics
Solve the equation. Give an exact solution.log5 x = -3
A. -15
B. 
C. 
D. 2
Mathematics