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Anit [1.1K]
2 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]2 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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PLEASE HELP GRADE IN MATH IS REALLY LOW IM STUPID. Question 1 (Multiple Choice Worth 5 points)
sergeinik [125]

1. No, it is not a valid inference because her classmates do not make up a random sample of the students in the school

2. 80 students

3. 696 students

4. Yes, this is a valid inference because she took a random sample of the neighborhood

3 0
3 years ago
Could you solve it? I don't know how to solve it:(
Nikitich [7]

Answer:

-1, 4

Step-by-step explanation:

log_2x+ log_2(x-3)=2 \\ log_2 \{x(x-3) \}=2  \\ x(x - 3) =  {2}^{2}  \\  {x}^{2}  - 3x = 4 \\  {x}^{2}  - 3x - 4 = 0 \\  {x}^{2}  - 4x + x - 4 = 0 \\ x(x - 4) + 1(x - 4) = 0 \\ (x - 4)(x + 1) = 0 \\ x - 4 = 0 \:  \: or \:  \: x + 1 = 0 \\  x = 4 \:  \: or \:  \: x =  - 1 \\  \huge \red{ \boxed{x =  \{ - 1, \:  \: 4 \}}}

5 0
2 years ago
Someone please help meeeeeeeeeeeeeeee
Dmitrij [34]

Answer:

y=(1/2)x-1 change the + to -

Step-by-step explanation:

the line moves down to touch all of the coins

6 0
2 years ago
Read 2 more answers
Anthony's math teacher finds that there's roughly a linear relationship between the amount of time students spend on their homew
Helen [10]

The meaning of the x-value when y=90 means that Anthony will use 3.1 hours.

<h3>What is an equation?</h3>

An equation is the statement that illustrates that the variables given. In this case, two or more components are taken into consideration to describe the scenario.

The relationship that can be represented by the equation y=57+7.4x,

where

y represents the expected quiz score

x represents hours spent on homework that week.

When y = 90, the value of x will be:

y=57+7.4x

57 + 7.4x = 90

Collect like terms

7.4x = 90 - 57

7.4x = 23

Divide

x = 23/7.4

x = 3.1

He'll use 3.1 hours.

Learn more about equations on:

brainly.com/question/2972832

#SPJ1

3 0
1 year ago
Reflect quadrilateral SQRT over the y-axis. Then translate the new quadrilateral 3 units to the right. What are the coordinates
wel

Answer: S(-5;3) Q(-2;2) R(-3;-2) T(-6;-1)

When reflected over the y-axis, their x values will change sign

S(5;3) Q(2;2) R(3;-2) T(6;-1)

Translate 3 units to the right, their x values will increase by 3

S(8;3) Q(5;2) R(6;-2) T(9;-1)

Step-by-step explanation:

4 0
3 years ago
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