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umka2103 [35]
3 years ago
7

A box of 25 light bulbs is shipped to a hardware store.when it arrives,four of the bulbs are broken.predict the number of broken

light bulbs in an order of 125 bulbs
Mathematics
1 answer:
anyanavicka [17]3 years ago
3 0
First you need to divide 125 / 25 which is 5 then you do subtraction 21 x 5 which is 105, then you subtract again 125 - 105 which is 20, 20 light bulbs will be broken. Or you could have just multiplied 5 by 4 which is the amount of light bulbs that were broken which is a lot easier...
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Five years ago, John’s age was half of the age he will be in 8 years. How old is he now?
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Answer:

18

Step-by-step explanation:

x-5=(x+8)/2

x-5=x/2+4

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x=x/2+9

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x/2=9

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Amy's grandmother gave her 3 identical chocolate chip cookies and 4 identical sugar cookies. In how many different orders can Am
Dmitrij [34]

Answer:

chocolate chip cookie first: 15 ways

chocolate chip cookie last: 15 ways

chocolate chip cookie first and last: 5 ways

Step-by-step explanation:

There is a total of 7 cookies.

Is she eats a chocolate cookie first, she will have 2 chocolate cookies and 4 sugar cookies (6 in total).

So, to find the number of different orders that Amy can eat the remaining cookies, we just need to calculate a combination of 6 choose 2 (that is, the number of ways we can put the 2 chocolate cookies among the 6 cookies) or a combination of 6 choose 4 (same thing, but for the sugar cookies):

C(6,2) = 6! / (2! * 4!) = 6 * 5 / 2 = 15 ways

Is she eats a chocolate cookie last, she will have 2 chocolate cookies and 4 sugar cookies (6 in total), so the problem is solved again with a combination of 6 choose 2:

C(6,2) = 15 ways

Is she eats a chocolate cookie first and last, she will have just 1 chocolate cookie left and 4 sugar cookies (5 in total), so the problem is solved with a combination of 5 choose 1 or a combination of 5 choose 4:

C(5,1) = 5! / (1! * 4!) = 5 ways

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3 years ago
Shanice's school is selling tickets to a play. on the first day of ticket sales the school sold 11 adult tickets and 6 student t
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A poll conducted in 2013 found that 52% of u.s. adult twitter users get at least some news on twitter.40. the standard error for
FinnZ [79.3K]
The 99% confidence interval for the population proportion is given by

sample \ proportion \pm 2.575\times standard \ error

Given that 52% = 0.52 is the standard proportion and the standard error is 2.4% = 0.024.

Therefore, the <span>99% confidence interval for the fraction of u.s. adult twitter users who get some news on twitter is given by

0.52\pm2.575\times0.024=0.52\pm0.0618=(0.4582, \ 0.5818)

</span>Therefore, the <span>99% confidence interval for the fraction of u.s. adult twitter users who get some news on twitter is 45.82% and 58.18%.

The interpretation of the confidence interval</span> is as follows: "We are 99% confident that the fraction of U.S. adult twiter users who get some news on twitter is between 45.82% and 58.18%.
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4 years ago
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