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3 years ago

Math:(

Mathematics

1 answer:

dimulka [17.4K]3 years ago

6 0

Answer:

Your friend is incorrect because if you divide 21 by 7 you will get 3 if you add 7 to 3 you get 10 therefore your friend is incorrect.

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If no digit may be used more than once, how many 5-digit numbers can be formed using only the digits 3, 8, 1, 2, 5, and 7?

Margaret [11]

The number of permutations of $m(0\leq m\leq n)$ objects from n objects is

$P(m,n)=\frac{n!}{(n-m)!}$

Here 5 digits are chosen from 6 digits without replacement (order important).

The number of 5 digit numbers that can be formed is

$\frac{6!}{(6-5)!} =6!=720$

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2 years ago

The state Department of Transportation wants to know about out-of-state vehicles that pass over a toll bridge

Travka [436]

Not sure hope you get your answer tho

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3 years ago

When the votes were counted, it was found that 15% of the people in Brenham had voted. If 2100 had voted, how many people lived

kherson [118]

Answer:

14000 people lived in Brenham

Explanation:

original number shall be always 100%

15% ---> 2100

1% ---> 2100/15

1% ----> 140

100% ---> 140 * 100 = 14000 people

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2 years ago

If a sphere has a radius of 2 cm, what is the approximate surface area of the sphere

Free_Kalibri [48]

The answer is 50.27cm²

8 0

2 years ago

Read 2 more answers

After typing 1/4 of a term paper on Friday, Richard completed 2/3 of the remainder on Saturday. If he wanted to finish the paper

Simora [160]

Answer:
$\frac{7}{12}$ of the paper

Explanation:
On Friday:
Richard finished 0.25 of the term paper.
This means that:
Remaining = 1 - 0.25 = 0.75 of the paper

On Saturday:
Richard finished $\frac{2}{3}$ of the remainder.
This means that:
Richard finished $\frac{2}{3} * \frac{1}{4} = \frac{1}{6}$

Now, for Sunday:
We know that Richard finished 0.25 of the paper on Friday and $\frac{1}{6}$ of the paper on Saturday.
This means that:
Total finished = 0.25 + $\frac{1}{6}$ = $\frac{5}{12}$ of the paper
If he wants to finish it by Sunday, then:
He needs to type = 1 - $\frac{5}{12}$ = $\frac{7}{12}$ of the paper

Hope this helps :)

4 0

2 years ago