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sergiy2304 [10]
3 years ago
10

If a snowball melts so that its surface area decreases at a rate of 7 cm2/min, find the rate at which the diameter decreases whe

n the diameter is 10 cm.
Mathematics
2 answers:
yanalaym [24]3 years ago
6 0
Dr/dt = -7 / (pi*r*8)
 
         =  -7 / pi*5*8
       
          = - 0.56 cm/min

Hope this helps



vivado [14]3 years ago
3 0
Surface area: S
radius: r
diameter: e
time: t

[dS/dt] = [dS/de]*[de/dt] => de/dt = [dS/dt] / [dS/de]

S = 4pi*r^2 = 4p*i(e/2)^2 = pi*e^2 => dS/de =2pi*e

dS/dt = 7cm^2 / min

de / dt = [2pi*e] / [7cm^2/min] =[7cm^2/min] /  [2pi*10cm]  = 0.11 cm/min 




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They must sell 106 more pizzas to earn $750.

Step-by-step explanation:

We are given that Mrs. Canale class is selling frozen pizzas to earn morning for a field trip. For every pizza sold, the class makes $5.35.

They have already earned $182.90, but they need $750. We have to find that how many more pizzas must they sell to be able to earn $750.

So, Firstly we will find that how much money did they have to earn more to be able to reach at $750.

Since, it is given that they have already earned $182.90.

So, Amount of more money they have to earn to reach at $750 = Final amount - Amount they already have

         = $750 - $182.90 = $567.1

<em>That means they have to earn $567.1 more to be able to reach at $750 mark. </em>

Also, it is known that the price of every pizza sold = $5.35

So, Number of pizza that should be sold to earn an amount of $567.1 is given by;

         <u>Number of pizzas</u> = \frac{567.1}{5.35} = \frac{5670}{535} = 106

Therefore, Mrs. Canale class must sell 106 more pizzas to be able to earn a total amount of $750.

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