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anonymous
 4 years ago
Can someone please check the attached problems?
anonymous
 4 years ago
Can someone please check the attached problems?

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0why yes, I would be happy to :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.03b), did you just use negative 500 mg for I(t)?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0yes, it needs to have been 500 = 3t^2 + 126t

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0try quadratic formula again with 0 = 3t^2 + 126t  500

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0http://www.wolframalpha.com/input/?i=500+%3D+3t^2%2B126t Ibuprofen level starts at zero, take a pill, levels increase past 500, peak, and drop back below 500. The points the quadratic formula produces are the t values that go with the I(t) levels of 500

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Start your set up by saying I(t) = Ibuprofen level at time t after taking pill. I(t) = 3t^2 + 126t when is I(t) = 500? I(t) = 500 = 3t^2 + 126t 0 = 3t^2 + 126t  500 then use quadratic formula. Result is 2 t values which are possible times after taking pill before I(t) level of ibuprofen is equal to 500. The problem asks for the longest time, so you would need to select the larger t value.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0consolation prize... you had part (a) correct :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0So 3(a) is correct and I have to fix 3(b)?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I think prob 4 is right too.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ugh bad laptop! Yes, 3b needs fixing, but you were close... just set up I(t) = 500, put in the expression for I(t), subtract 500 from both sides to get 3t^2 +126t  500 = 0, and then use quadratic formula

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0you just jumped into it too fast and put the 500 on the wrong side.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Always glad to help... I am really really really really really love the fact that you try these problems first and then post them for us to talk through... that is how this site is SUPPOSED to work!!

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Now I have to get going though :) see you next time :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0See you next time :) Thank you so much :)
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