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vladimir1956 [14]
2 years ago
9

The volume Vr (in cubic meters) of a spherical balloon with radius r meters is given by =Vr43πr3. The radius Wt (in meters) afte

r t seconds is given by =Wt+7t3. Write a formula for the volume Mt (in cubic meters) of the balloon after t seconds. It is not necessary to simplify.
Mathematics
1 answer:
Arte-miy333 [17]2 years ago
7 0

Answer:

M_t=\frac{1372}{27}\pi t^9

Step-by-step explanation:

We are given that Volume of spherical balloon in cubic meters

V_r=\frac{4}{3}\pir^3

We have to find the value of volume of the balloon after t seconds.

We are given that radius of spherical balloon after t seconds

W_t=7t^3

Substitute the value then we get

M_t=\frac{4}{3}\pi(7t^3)^3

M_t=\frac{1372}{27}\pi t^9

Hence, the volume of spherical balloon is given by the formula

M_t=\frac{1372}{27}\pi t^9

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Sheila was given $20.00 for her birthday and spent $14.79 on a CD. How much was her change?
alexira [117]

Answer:

$5.21

Step-by-step explanation:

20.00 - 14.79 = 5.21

3 0
1 year ago
Read 2 more answers
18. Manufacturers often package products in a way that uses the least amount of material One measure of the efficiency of a pack
Lemur [1.5K]

Answer:

a.  E=\frac{2h+2r}{rh}

b.

E of first can = E=\frac{2h+2r}{rh}

E of second can = E=\frac{h+2r}{rh}

c.  Yes

Step-by-step explanation:

The efficiency ratio is:

E = Surface Area / Volume

a.

We can write:

E=\frac{S}{V}

Where

S is surface area of cylinder

V is volume of cylinder

The formulas are:

S = 2\pi rh+2\pi r^2

V = \pi r ^2 h

So, the <u>efficiency ratio (E) </u>is:

E=\frac{2\pi rh+2\pi r^2}{\pi r^2 h}\\E=\frac{\pi r(2h+2r)}{\pi r(rh)}\\E=\frac{2h+2r}{rh}

b.

The first can has radius "r" and height "h", so the efficiency ratio is:

E=\frac{S}{V}\\E=\frac{2\pi rh+2\pi r^2}{\pi r^2 h}\\E=\frac{\pi r(2h+2r)}{\pi r(rh)}\\E=\frac{2h+2r}{rh}

The second can has same height, "h", and twice radius, "2r", so the efficiency ratio becomes:

E=\frac{S}{V}\\E=\frac{2\pi (2r)h+2\pi (2r)^2}{\pi (2r)^2 h}\\E=\frac{4\pi rh +8\pi r^2}{4\pi r^2h}\\E=\frac{4\pi r(h+2r)}{4\pi r(rh)}\\E=\frac{h+2r}{rh}

c.

We now need to say if the company made a good decision or not.

If you look at both the Efficiency ratios above, you will see that the difference is in the numerator.

The first can has "2h"

The second can has "h"

The "2h" makes the numerator for the first can BIGGER than the "h" of the second can, so the Efficiency ratio of first can is thus, BIGGER.

We need smaller ratio.

So, 2nd can has indeed smaller ratio, so the company made a good decision.

6 0
2 years ago
Claire for to a show sale. Everything on the shelf is 35% off the marked price. She falls in love with a pair of red heels that
lyudmila [28]
Percentage of discount on the Marked price = 35%
Marked price of the pair of red heels that Claire falls in love with = $64.99
Then
Amount of discount on the
marked price of the pair of red heels = (35/100) * 64.99 dollars
                                                           = 0.35 * 64.99 dollars
                                                           = 22.746 dollars
                                                           = 22.75 dollars
Then
Price of the red heels after discount = (64.99 - 22.75) dollars
                                                           = 42.24 dollars
Percentage of sales tax that needs to be given by Claire = 7.5%
Amount of sales tax that needs to be given by Claire = (7.5/100) * 42.24 dollars
                                                                                     = 316.80/100 dollars
                                                                                     = 3.168 dollars
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Then
The total price of the
red heels that Claire has to pay = (42.24 + 3.17) dollars
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So Claire has to pay a total of $45.41 for the pair of red heels she has fallen in love with.
8 0
1 year ago
Boris chooses three DIFFERENT numbers.
g100num [7]

Answer:

4, 5, 27.

Step-by-step explanation:

Let us find our numbers using given information.

Factors of 20 are: 1,2,4,5,10 and 20.

Let us try by taking number 4 and 5.

36-(4+5)=36-9=27  

We can see that 3^{3} =27

Now let us find sum of these numbers.

4+5+27=36

Therefore, numbers chosen by Boris will be 4, 5 and 27 as these numbers satisfies our all conditions.


6 0
2 years ago
What is the exponential notation for 262,144
7nadin3 [17]

since there is always a decimal at the end of every value so :

           = 262144.0 

        you move the decimal backwards if there is no decimal between the value. you place the decimal after the 1st digit, you will also count the digits you have passed : 

         = 2.62144 X 10^5 

you passed 5 values so you put 5 in exponent form.


7 0
1 year ago
Read 2 more answers
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