The profit P (in hundreds of dollars) that a company makes depends on the amount x (in hundreds of dollars) the company spends on advertising according to the model
?
?
What expenditure for advertising will yield a maximum profit?
?
A. 30
B. 0.5
C. 230
D. 15
E. 115
Answer: A
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The table below is the probability table for a random variable X. Find E(X). 
Enter just a reduced fraction of form 
.
Fill in the blank(s) with the appropriate word(s).
Last year, 1,488 calculators were returned to the manufacturer. If 79,000 were produced, assign a number to specify the probability that a particular calculator would be returned. Please round your answer to the nearest thousandth. ? The probability is about __________.
Fill in the blank(s) with the appropriate word(s).
Plot the graph of the equation. Check for symmetries and find all x- and y-intercepts.9x2 - 4y2 = 36
A. 
B. 
C. 
D. 
Solve. Write a mixed numeral for the answer.June wants to work for 11
hours at her part-time job this week. She has already worked 6
hours. How many more hours does she need to work?
A. 5
hr
B. 3
hr
C. 4
hr
D. 4 hr