Find the expected value of the probability density function to the nearest hundredth.f(x) = 
- 
; [3, 4]
A. 8.28
B. 3.53
C. 3.75
D. 3.50
Answer: B
Mathematics
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Divide. Write a mixed numeral for the answer whenever possible.
A. 146
B. 146
C. 147
D. 147
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Solve the equation and express the solution in exact form.ln 2x + ln 9x = ln 19
A. {1}
B. {0}
C. 
D. 
Mathematics
Evaluate the expression without using a calculator.log7
A. 1
B. 
C. 
D. 7
Mathematics
Solve the problem.An airplane flies 470 miles with the wind and 310 against the wind in the same length of time. If the speed of the wind is 20, what is the speed of the airplane in still air?
A. 102.5 mph B. 38.75 mph C. 97.5 mph D. 87.5 mph
Mathematics