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4 years ago

MATH PROBLEM NEED ANSWER ASAP!!!

Mathematics

1 answer:

vitfil [10]4 years ago

3 0

2 feet of the board remain

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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:

After 47 days she will have more than 90 trillion pennies.

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

MAKE A RAP ABOUT SCHOOL GIVING BRAINLIEST AND 100 POINTS <3

Licemer1 [7]

Ayo,I gotta explain u complain a lot these days u make me feel tired even math u can’t solve ur own problems teachers u know everything but when I ask u a questioning become my student ur boring- I tried hhh

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2 years ago

7500millimeter=________meter

kykrilka [37]

Answer:

7.5 meters

Step-by-step explanation:

7500÷1000=7.5

You divide by 1000

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3 years ago

Read 2 more answers

Find the scale factor

Mama L [17]

Answer:

C. 50

Step-by-step explanation:

The triangles are proportional and that is why you can find the scale factor. Set up a proportion (equivalent fractions). Set the proportion up with the corresponding sides together on thee top or the bottom of the proportion.

65 = 91

x 70

91x = 65 * 70

91x = 4550

91 91

x = 50

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3 years ago

Use absolute value to express the distance between −13 and 17 on the number line.

AysviL [449]

I cant draw to show it on the number line

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4 years ago