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3 years ago

Sandra is asked to report on the recent increase in popularity of an application based on the number

Mathematics

1 answer:

aalyn [17]3 years ago

3 0

Answer:

Step-by-step explanation:

Report the number of downloads per day. By determining how this number is changing / increasing it will be possible to spot and describe an upward trend if there is one.

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Solve for n if nC2=nC4

vodka [1.7K]

$\\ \qquad\quad\sf\longmapsto ^nC_2=^nC_4$

$\boxed{\sf ^nC_r=\dfrac{n!}{r!(n-r)!}}$

$\\ \qquad\quad\sf\longmapsto \dfrac{n!}{2!(n-2)!}=\dfrac{n!}{4!(n-4)!}$

$\\ \qquad\quad\sf\longmapsto \dfrac{1}{2\times 1(n-2)!}=\dfrac{1}{4\times 3\times 2\times 1(n-4)(n-3)(n-2)!}$

$\\ \qquad\quad\sf\longmapsto 2=24(n-4)(n-3)$

$\\ \qquad\quad\sf\longmapsto 2=24\left\{n(n-3)-4(n-3)\right\}$

$\\ \qquad\quad\sf\longmapsto 2=24(n^2-3n-4n+12)$

$\\ \qquad\quad\sf\longmapsto 2=24(n^2-7n+12)$

$\\ \qquad\quad\sf\longmapsto 2=24n^2-168n+288$

$\\ \qquad\quad\sf\longmapsto 24n^2-168n=-286$

$\\ \qquad\quad\sf\longmapsto 24n^2-168n+286=0$

$\\ \qquad\quad\sf\longmapsto 12n^2-84n+143=0$

$\\ \qquad\quad\bf\longmapsto n=\dfrac{7}{3}\pm \dfrac{1}{3}\sqrt{3}$

8 0

3 years ago

What is <br><br> 4.2 = c/8<br><br> And it would be a lot helpful

liberstina [14]

Step-by-step explanation:

c = 8 × 4.2 (move 8 from the denominator to the side where the 4.2 is - make c the subject)

c = 33.6

7 0

3 years ago

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Please help!! Area!!

Alika [10]

Answer:

5*8*4

Step-by-step explanation:

Multipy them together lol

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3 years ago

Tom has 2 8-foot long boards he needs to cut pieces that are 15 inches long. How many 15 inch pieces can he cut from the two boa

Ksju [112]

Answer:

Tom can cut 12 (15 inch pieces) from the two boards.

Step-by-step explanation:

We're first given foot measurements and we're asked to find the answer in inches. That means we must convert 8 feet to inches, which is a 1:12 inches conversion. 8 times 12 will give you 96, so now you will multiply that value by 2 because Tom has 2 8-foot long boards. That will give you 192 inches. Since the question is asking for 'how many 15 inch pieces he can cut from the two boards?', you will need to divide 192 inches by 15 to find the answer. This will give you 12.8 boards. Because you can't have parts of an object, the answer will be 12 whole boards.

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4 years ago

Lina wants to go on a trip to Venezuela. If the ticket is $1,538 and she has $873, what percent of the money does she already ha

vovangra [49]

Answer:

Step-by-step explanation:

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3 years ago

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