# use the differential equation given by dy/dx=xy/3 , y > 0.

*label*Mathematics

*timer*Asked: Apr 9th, 2015

*account_balance_wallet*$5

### Question Description

For Questions 1-3, use the differential equation given by dy/dx=xy/3 , y > 0.
Complete the table of values
x -1 -1 -1 0 0 0 1 1 1
y 1 2 3 1 2 3 1 2 3
dy/dx
On the axes below, sketch a slope field for the given differential equation using the nine points on the table that you found.
Find the particular solution y = f(x) to the given differential equation with the initial condition f(0) = 4.
Use the following information for Questions 4 and 5.
Newton's law of cooling states that the rate of cooling of an object is proportional to the temperature difference between the object and its surroundings. So the rate of cooling for a bottle of lemonade at a room temperature of 75F Which is placed into a refrigerator with temperature of 38F can be modeled by dT/dt=k(T-38) Where T(t) is he temperature of the lemonade after t minutes and T(0)=75. After 30mins the lemonade has cooled to 60F, so T(30)=60.
4. To the nearest degree, what is the temperature of the lemonade after an additional 30 minutes?
5. To the nearest minute, how long does it take for the lemonade to cool to 55F?

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