During the past 10 years, the amount of money, M (in billions of dollars), spent in North America by car dealerships advertising their product can be modeled by the equation M = 0.15e^0.3t + 0.78. In what year was about $3 billion (M = 3) spent by car dealerships in advertising?
A. t = 9
B. t = 10
C. t = 8
D. t = 3

Question

During the past 10 years, the amount of money, M (in billions of dollars), spent in North America by car dealerships advertising their product can be modeled by the equation M = 0.15e^0.3t + 0.78. In what year was about $3 billion (M = 3) spent by car dealerships in advertising?  
A. t = 9
B. t = 10
C. t = 8
D. t = 3

agent0smith · Answer

I told you two methods. I don't know which you did, and you didn't show any work, so I don't know.

jskinny0831 · Answer

could you just explain it to me

agent0smith · Answer

Try showing what you did. It's not that hard.

agent0smith · Answer

Show your work. As in the steps.

anonymous · Answer

hummm what do you think

agent0smith · Answer

Why are you so against showing your work...

agent0smith · Answer

Because it seems like you just want the answer to be given to you. 

You've posted this question two or three times already and only guessed so far.

anonymous · Answer

well understand this he is smarter then me so i believe you should listen to him he is much smarter then me so i think you should listen to him :) sorry

agent0smith · Answer

Because it seems like you just want the answer to be given to you. 

You've posted this question two or three times already and only guessed so far.

anonymous · Answer

yes true but so @jskinny0831 listen to him 
the comment above was ment for u @jskinny0831