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3 years ago

In how many ways can a president and a vice president be randomly selected from a class of 20 students?

Mathematics

1 answer:

SpyIntel [72]3 years ago

7 0

Answer:

n how many ways can a president, vice president, and a secretary be chosen? It is 12X11X10. Permutation of n things taken r at a time: nPr=n!/(n-r)! 12P3=12*11*10*9!/9!= 12*11*10=1320 ways.

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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3 years ago

The cost (c) to hire a dog trainer is varies directly with the amount of time (h) in hours spent training the dog.

NNADVOKAT [17]

Answer:

Part A) The proportional equation is $c=55h$

Part B) 8 hours of training

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form $y/x=k$ or $y=kx$

Let

c -----> the cost to hire a dog

h ----> the amount of time in hours

The linear equation is equal to

$c=kh$

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substitute the values

$k=660/12=55$

therefore

The linear equation is

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substitute in the equation and solve for h

$440=55h$

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3 years ago

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Ainat [17]

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