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Anit [1.1K]
3 years ago
8

How many ways are there to select 25 books from a collection of 27 books? i am just studying today

Mathematics
1 answer:
laiz [17]3 years ago
4 0

notice, this will just be a Permutation.

\bf _nP_r=\cfrac{n!}{(n-r)!}\qquad \qquad \stackrel{\textit{25 books off a total of 27}}{_{27}P_{25}=\cfrac{27!}{(27-25)!}} \\\\\\ _{27}P_{25}=\cfrac{27!}{2!}\implies 5444434725209176080384000000

you can always check your calculator also for a [ ₙPᵣ  ] button.

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Triangles are similar. Round answer to nearest tenth (step by step)
ozzi

Answer:

13.5

Step-by-step explanation:

Similar = alike but not the same

A lot of times in geometry it would mean that they have the same shape, just different size, so first find the ratio:

6/12 = 1/2

27 * 1/2 = 27/2 = 13.5

7 0
2 years ago
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How would I do this? What would it be?
Vinvika [58]

50

Step-by-step explanation:

Since AE is the bisector of angle BAC,so angle BAE and Angle CAE is equal. Here Angle CAE and Angle EAC is same.

therefore,

m(Angle BAE)=m(Angle EAC)

x + 30 = 3x - 10

or, 2x=40

or, x=20

Hence,

m(Angle EAC)=

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4 0
3 years ago
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Can you help me plzs
Jlenok [28]

Answer:

164

Step-by-step explanation:

2x+7+5x+12=180

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7x+180-19

7x=171

----  ----

7      7

x=164

6 0
3 years ago
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Midpoint Between Two Given Points
kondaur [170]

Answer:

(1, -7)

Step-by-step explanation:

the difference between -4 & 6 is 10 so you add 5 (half) to -4 or subtract from 6, this gives you 1

you do the same for -9 and -5, the midpoint for those being -7, I hope this helps

4 0
2 years ago
Add (13x – 4) and (–6x + 15)
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(13x – 4) + (–6x + 15) =

13x - 4 - 6x + 15 =

7x + 11

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3 years ago
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