3 years ago

How many ways can a librarian arrange 15 books on a top shelf if she has 20 books from which to pick?

2 answers:

8 0

Use the permutation formula
nPr = (n!)/((n-r)!)
20P15 = (20!)/((20-15)!)
20P15 = (20!)/(5!)

The final answer is choice A

Inga [223]3 years ago

8 0

The correct answer is A turned this in got a 100 hoped this helped ya.

You might be interested in

What transformation(s) were made to the original f(x) = x graph?

Greeley [361]

Yes it x equals 4 and y equals 8 hope this helps

4 0

3 years ago

Two angles are suppiementary, One angle is three times the measure of the other. What are the measures of the angles? Enter only

laiz [17]

Answer:

135 degrees and 45 degrees

Step-by-step explanation:

Two angles are supplementary when their sum adds up to 180 degrees.

4 0

3 years ago

Find the value of x. X=

givi [52]

Answer:

x = 65

Step-by-step explanation:

The opposite angles of a cyclic quadrilateral sum to 180° , then

x + 115 = 180 ( subtract 115 from both sides )

x = 65

5 0

2 years ago

Answer the following: a) 2x32 = b) (2 x 3)2 =

wel

Answer:

a) 64 b) 12

Step-by-step explanation:

32 + 32 = 64

2*3 = 6

6*2 = 12

6 0

3 years ago

Read 2 more answers

Fuel x costs $2 per gallon and fuel y costs $3 per gallon. You have at most $18 to spend on fuel. Write a system of linear inequ

madam [21]

Answer:

First choice A : 2x +3y is less than or equal to 18. x greater than or equal to 0. y greater than or equal to 0.

3 0

3 years ago

Read 2 more answers