Can anyone help me with PreCalc?
Write the equation of an exponential function given the points (1,48) and (2,24)?

Question

Can anyone help me with PreCalc? 
Write the equation of an exponential function given the points (1,48) and (2,24)?

ganeshie8 · Answer

hint : 48/2  = 24

anonymous · Answer

So... in A(t) = A0*e^(-k*t)
1/2 =A?
I'm sorry, my teacher has taught me nothing this year, and expects us to know this.

anonymous · Answer

@ganeshie8

ganeshie8 · Answer

forget about e

ganeshie8 · Answer

:)

ganeshie8 · Answer

simpler than that

ganeshie8 · Answer

since going from 1 to 2, is halving the value, the exponential funciton shud be of form :-

$\large       y = k \frac{1}{2^x}$

anonymous · Answer

Okay... so how would I find the equation given the points?

ganeshie8 · Answer

since y = 48, when x = 1,

k = 96

ganeshie8 · Answer

so the exponential equation wud be

$\large     y = 96  \times   2^{-x}$

ganeshie8 · Answer

see if that makes some sense

anonymous · Answer

Alright, I'll try to figure it out from there(: Thanks!

ganeshie8 · Answer

good :) u will have to see it for urself i guess