The amount of water left in a cup after sitting outside in the sun can be modelled by the function A(t) = 120((12)^t/3 where A(t) represents the amount of water in mL and t represents the time passed in hours
a) write down how much water will be there after 24 hours. Round your answer to 2 decimal places.
b) write down how long it takes for the amount of water to get to 15 mL
4 answers
See comment in your previous post of this
can u give link to that
I had stated :
"Check the typing of your equation.
The way it stands, it would be an increasing function, not representing the "amount of water left .." of your question."
I don't know why that reply did not show up.
Perhaps I didn't even click on "submit", need another coffee.
"Check the typing of your equation.
The way it stands, it would be an increasing function, not representing the "amount of water left .." of your question."
I don't know why that reply did not show up.
Perhaps I didn't even click on "submit", need another coffee.
again? Why do you always start a whole new post when following up? And why do you not even correct your fractions and mismatched parentheses?
Clearly you should have written
A(t) = 120*(1/2)^(t/3)
(a) 24 hours is 8 half-lives, so 1/256 is left: 120/256 = ___
(b) now just solve
120*(1/2)^(t/3) = 15
15/120 = 1/8, so that is 3 half-lives, so t=9
Clearly you should have written
A(t) = 120*(1/2)^(t/3)
(a) 24 hours is 8 half-lives, so 1/256 is left: 120/256 = ___
(b) now just solve
120*(1/2)^(t/3) = 15
15/120 = 1/8, so that is 3 half-lives, so t=9