1) I'm not really sure how to get this, i know the answers but i can't get them(adsbygoogle = window.adsbygoogle || []).push({});

for the first range, f(x) is obviously 0.15x, but i can't get the next ones. The second range answer is 0.28x - 3295.50. can someone tell me how to get this answer?

http://i2.photobucket.com/albums/y15/seiferseph/2.jpg

2) i'm not quite sure how to find the limit when t aproaches infinity. i don't know the rules of exponents w/ infinity, the answer is 6.5, how do i get it?

http://i2.photobucket.com/albums/y15/seiferseph/3.jpg

3) how do i solve b? some hints would be perfect, thanks!

http://i2.photobucket.com/albums/y15/seiferseph/1.jpg

thanks again!

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# Derivatives questions

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