Perform the indicated operations and simplify.
- 
+ 
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Solve for x.log9 x + log9 (x - 80) = 2
A. -1, 81 B. 1, -81 C. 9 D. 81
Mathematics
Find the derivative.y = 9 sin 5x cos x
A. 9 sin 5x sin x + 45 cos x cos 5x B. sin 5x sin x + 45 cos x cos 5x C. -9 sin 5x sin x + 45 cos x cos 5x D. -9 sin 5x sin x + cos x cos 5x
Mathematics
Find the expected value.A new light bulb has been found to have a 0.02 probability of being defective. A shop owner receives 500 bulbs of this kind. How many of these bulbs are expected to be defective?
A. 20 B. 100 C. 10 D. 500
Mathematics
Without graphing the function, determine its amplitude or period as requested.y = 
cos (- 
x)Find the period.
A. 
B. 
C. 
D. 
Mathematics