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15.04.2020 •
Mathematics
Suppose the price p, in dollars, and number of sales, x, of an item is related by 5 8 6 50 p x px + + = . If p and x are functions of time, measured in days, find the rate at which x is changing when x = 15, p = 2.90 and dp/dt = -1.15
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Ответ:
According to the information of the problem x = 15 , p=2.90 and dp/dt = -1.15
then![\frac{dx}{dt} = -3.357\\](/tpl/images/0600/9452/7a701.png)
Step-by-step explanation:
Since everything is changing with respect to time and
are related according to the following equation
We need to find the implicit derivative with respect to the time. And we get the following.
Now. According to the information of the problem x = 15 , p=2.90 and dp/dt = -1.15
then![\frac{dx}{dt} = -3.357\\](/tpl/images/0600/9452/7a701.png)
Ответ: