Answer:B
I got it right on my test
Step-by-step explanation:
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The equation which represent total amount of income he earns from selling book is, 
Since, Selling price of one novel is n dollars
So, selling price of b books is, 
Since, he receives 9% commission on each book sale.
So, total commission he receives on selling of b books is,

And also he received a bonus of $50,000 to sign the contract to write the book,
So, total amount of income he earns is represented by A,

Learn more:
brainly.com/question/7852218
You use the for a cos(bx - c) + d to find your answer.
Amplitude = 5
Period = 2pi / 3
Phase shift = pi / 3 (moving to the right)
Midline or Vertical shift = 2
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