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14 The bar graph below shows the number of pets sold at a pet store in one week.
Pet Sales
A
Number of Pets Sold
45
40
35
30
25
20
15
10
5
0
Cats
Fish
Dogs
Birds
Gerbils
What percent of the pets sold that week were cats?
A 35%
C 30%
B 20%
D 25%
add speaker notes
No

f(x)=4

step-by-step explanation:

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there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."