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OleMash [197]
4 years ago
8

Please help before my teacher gets mad at me

Mathematics
1 answer:
Advocard [28]4 years ago
4 0

Answer:

a) 412 have a brother or sister in the school

b) 242 are girls

c) 339 are 13 years old or under

Step-by-step explanation:

Part a:

515 x 80%

412

Part b:

515 x 47%

242

Part c:

515 x 66%

339

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A leprechaun places a magic penny under a girls pillow. The next night there are 2 magic pennies under her pillow. The following
kiruha [24]

Answer:

<em>After </em><em>47</em><em> days she will have more than 90 trillion pennies.</em>

Step-by-step explanation:

At the beginning there was 1 penny. At the second day the amount of pennies under the pillow became 2.

The amount of pennies doubled each day. So the series is,

1,2,4,8,16,32,.....

This series is in geometric progression.

As the pennies from each of the previous days are not being stored away until more pennies magically appear so the sum of series will be,

S_n=\dfrac{a(r^n-1)}{r-1}

where,

a = initial term = 1,

r = common ratio = 2,

As we have find the number of days that would elapse before she has a total of more than 90 trillion, so

\Rightarrow 90\times 10^{12}\le \dfrac{1(2^n-1)}{2-1}

\Rightarrow 90\times 10^{12}\le \dfrac{2^n-1}{1}

\Rightarrow 90\times 10^{12}\le 2^n-1

\Rightarrow 2^n\ge 90\times 10^{12}+1

\Rightarrow \log 2^n\ge \log (90\times 10^{12}+1)

\Rightarrow n\times \log 2\ge \log (90\times 10^{12}+1)

\Rightarrow n \ge \dfrac{\log (90\times 10^{12}+1)}{\log 2}

\Rightarrow n \ge 46.4

\Rightarrow n\approx 47


8 0
3 years ago
If you take a number, times by 8 then add 6. You get the same as if you took the number, times by 3 then subtract 7. What is the
bearhunter [10]

I don't say you have to mark my ans as brainliest but if it has really helped u plz don't forget to thank me....

3 0
3 years ago
ASAP Please! :)
Bess [88]
According to the Ti 83:

MAD for Dataset 2 is 1.4444

And the ratio is 5/4
3 0
3 years ago
At a zoo, the lion pen has a ring-shaped sidewalk around it. The other edge of the sidewalk is a circle with a radius of 11 m. T
Vikentia [17]
Diameter = 2r
6 = 2r r = 3 for the radius of the flowerbed
If we were to include the sidewalk around the bed, the diameter would stretch out another meter in both directions, meaning adding 2 meters to the diameter making the new diameter 6 + 2 = 8 and 8/2 = 4 so 4 = radius of the circle including the sidewalk. Find the area of the big circle and subtract the area of the smaller circle to find the area of the sidewalk.
Small circle = pi*3 squared.
5 0
3 years ago
How do find length and width if you have the area?
chubhunter [2.5K]

Answer:

Step-by-step explanation:

The area of a rectangle(A) related to the length (L) and WITDH (W) of its sides by the following Relationship:A=L W if you know the width is easy to find the length rearranging this equation to get L=A÷w if you know the length and want width rearranged to get W=A÷L this is the formula not the answer.

5 0
4 years ago
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