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Leni [432]
2 years ago
9

A professor has 7 books they are trying to arrange on a shelf. If the professor selects 3 books at a time, how many different ar

rangements of books can they come up with?
i got 210 but im not sure
Mathematics
1 answer:
nlexa [21]2 years ago
7 0

<em>The number of </em><em>different arrangements </em><em>of books is 210</em>

What is the formula for Permutation?

Permutation in mathematics can be calculated by using the formula

nPr = \frac{n!}{(n - r)!}

where

  • nPr = Permutation required
  • n = total number of objects = 7
  • r = number of objects selected = 3

nPr = \frac{7!}{(7-3)!}

nPr = \frac{5040}{24}

nPr = 210

Therefore, the required number of ways is 210

learn more about permutations here brainly.com/question/112112

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Select the statements that are true about the graph.
torisob [31]

Answer:It's called the "y intercept" and it's the y value of the point where the line intersects the y- axis. For this line, the y-intercept is "negative 1." You can find the y-intercept by looking at the graph and seeing which point crosses the y axis. This point will always have an x coordinate of zero.

Step-by-step explanation:

The Y intercept of a straight line is simply where the line crosses the Y axis.

Example

Y intercept

In the above diagram the line crosses the Y axis at 1.

The Y intercept is equal to 1 and the point is written as (0,1). Notice that for the y-intercept the x-coordinate of the point is always zero..

8 0
3 years ago
An awards dinner costs $225 plus $5 for each person making reservations the total bill is $735 how many people attended the dinn
suter [353]

The number of people attended dinner is 102.

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

An equation is a mathematical statement when two algebraic expressions are equated by an equal sign.

It is given in the question that

An awards dinner costs $225 plus $5 for each person making reservations

the total bill is $735

people attended the dinner = ?

Let x number of people attended the dinner

$225 + $5 * x = $735

5x = 735-225

5x = 510

x = 102

Therefore , 102 people attended the dinner.

To know more about Equation

brainly.com/question/10413253

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3 0
2 years ago
= 9x2 +9x -18,/<br> 3x +6
Ede4ka [16]

Answer:24+3x

Step-by-step explanation:

maybee i just used photomath

3 0
3 years ago
Write an equation in standard form for:
Tasya [4]
Hello!
When finding the perimeter of a rectangle, you have to consider the properties of a rectangle. A rectangle has two pairs of equal sides where one is the width, while the other one is the length. 
Now looking back at your question, it says "... a rectangle that is x units wide" ⇒ you let the width = x ; this is the same with "y units long" ⇒ length = y. Perimeter can just be : P = 24.  
Therefore,
The equation would be:
x + x + y + y = P. 
2x + 2y = P.
(Sub in P = 24)
∴ 2x + 2y = 24. (This should be your answer.)
:) Good luck (Message me if you have any problem)








5 0
3 years ago
What is 96 multiplied by 72​
Wewaii [24]

Question: What is 96 multiplied by 72​.

Answer:6912

Steps:Multiple 96 x 72.

3 0
3 years ago
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