The sale price S (in dollars) of an item is given by the formula
S=L−rL , where L is the list price (in dollars) and r is the discount rate.
Since, S = L -rL
rL = L -S
r =
r =
Since, the listed price of the shirt is $30, we have to find the discount rate.
Therefore, r = is the discount rate.
An exponential function is a function defined by y = ab^x, where a represents the initial value, and b represents the rate
<h3>(a) The factor at which the medicine decreased, in 1.5 hour</h3>From the graph, we have the following ordered pairs
(x,y) = (0,270) and (1.5,80)
Given that:
At point (0,270), we have:
At point (1.5,80), we have:
Substitute 270 for a
Divide both sides by 270
Take 1.5th root of both sides
Hence, the medicine decrease in the hour and half at a factor of 0.44
<h3>(b) The factor at which the medicine decreased in the first half hour, and the first hour</h3>In (a), we have:
The decay factor (b) to be 0.44
This represents the factor at which the medicine decreased throughout.
Hence, the medicine decrease in the first half hour, and the first hour at a factor of 0.44
<h3>(c) The exponential equation</h3>In (a), we have:
So, the exponential equation is:
In terms of m and h, we have:
Hence, the equation relating m to h is
Read more about exponential equations at: