[5 pts] describe how and why the formula for permutations differs from the formula for combinations 4.

Permutations formula .

Combinations formula

Step-by-step explanation:

The premutations formula gives us the number of ways that we can choose k elements of a set of n elements, taking into account the order in which we choose the elements and is given by

The formula for combinations gives us the numbers of ways that we can choose k elements of a set of n elements without taking into account the order of the object. It's is given by

Ex: Let us take the set of letters

- C(4,2) gives us the number of pairs of letters that we can form with the letters from the set , in this case we the pairs AB and BA are the same.

-P(4,2) gives us the number of pairs of letters that we can form with the letters from the ser taking into acount the order of the pair, in this case the pairs AB and BA are different.

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.