find A, B and k
S(t)= A+Be^-kt
1. on the day the kettle is released, that is, at t=0, the annual sales of the kettle is zero
2. After one year, that is, t=1, the annual sales of the kettle is 3935
3. After a number of years (unknown), there would be annual sales of 10000 kettles
if approach t to infinity, A= 10000
but am not sure
and about the rest
thx
find A, B and k from equation S(t)= A+Be^-kt?
2012-12-09 3:29 am
回答 (2)
2012-12-09 3:37 am
✔ 最佳答案
1. At t = 0, S = 0. Plug in t = 0 and S = 0. You get 0 = A + B * 12. At t = 1, S = 3935. Plug in t = 1 and S = 3935. You get 3935 = A + B * e
That's two equations for the two unknowns A and B. You could subtract one from the other to eliminate A.
2012-12-09 11:33 am
A=1000 , then use 1/ 2/ to set up 2 equations for B , k
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