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I don't even have a clue as how to start or even what to google or look-up in my book for help

I got the answer for A, that was pretty straight forward

I have Q(1)=150, Q(2)=90, Q(3)=54

Hmm yah those looks correct. Part B) now huh? Hmmmm.

would it be like Q(t)=250-.6^t?

nope that doesnt work if i plug numbers in.. just a thought

oh its just 250*.6^t

Yay good job! C:

thanks! gave you a medal back

Able to figure out part C ok? :)

set it equal to 54 and solve for t, right?

i meant 75

Yah c: cool.

how would i get the t out of the exponent? I know to just divide by 250 on both sides

We have to use that nasty logarithm function to get it out of the exponent position! :O

then i'm left with \[\frac{ 75 }{ 250 }=.6^{t}\]

ohh ew. hows that go again?

\[\large .3=.6^t\]If we take the natural log of both sides,\[\large \ln .3=\ln\left(.6^t\right)\]

so ln.3=tln.6?

then just plug the two logs into my calculator and then divide over to solve for t?

Yep looks good \c:/
Mr Calculator has to finish it up for us!

awesome. thanks as always!