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2 years ago

A boat travels 400 miles at a rate of 20 miles per hour. How many hours did it travel?

Mathematics

2 answers:

Taya2010 [7]2 years ago

7 0

Answer:

Time taken = 20 hours

Step-by-step explanation:

Speed = distance travelled / time taken

20 mi/hr = 400 mi / time taken

Time taken = 400 mi / 20

Time taken = 20 hours

UNO [17]2 years ago

6 0

Answer:

20 hours

Step-by-step explanation:

400 divided by 20 is 20

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Read 2 more answers

Suppose we want to choose 7 colors, without replacement, from 9 distinct colors

Digiron [165]

The number of ways to choose the colors is 36

<h3>How to determine the number of ways?</h3>

The given parameters are:

Colors = 9

Colors to choose = 7

Since order does not matter, then it is combination

This is calculated using:

$^nC_r = \frac{n!}{(n - r)!r!}$

This gives

$^nC_r = \frac{9!}{7!2!}$

Evaluate

$^nC_r = 36$

Hence, the number of ways is 36