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3 years ago

A car drives 60 miles per hour. Write and solve an equation to find the number of hours it takes the car to travel 360 miles.

Mathematics

2 answers:

Degger [83]3 years ago

4 0

360 miles divided by 60 miles per hours = 6 hours

it will take 6 hours

Alex Ar [27]3 years ago

4 0

Answer:

$d=s\times t$

The number of hours it take the car to travel is 6 hours.

Step-by-step explanation:

Given : A car drives 60 miles per hour.

To find : Write and solve an equation to find the number of hours it takes the car to travel 360 miles ?

Solution :

The speed of the car is s=60 miles per hour.

The distance covered is d=360 miles.

Let the time taken to cover the distance is t=t hours

The relationship between the speed, time and distance is

$\text{Distance}=\text{Speed}\times \text{Time}$

The equation form is

$d=s\times t$

$360=60\times t$

$t=\frac{360}{60}$

$t=6$

The number of hours it take the car to travel is 6 hours.

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7) PG & E have 12 linemen working Tuesdays in Placer County. They work in groups of 8. How many

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Part A

Since order matters, we use the nPr permutation formula

We use n = 12 and r = 8

$_{n}P_{r} = \frac{n!}{(n-r)!}\\\\_{12}P_{8} = \frac{12!}{(12-8)!}\\\\_{12}P_{8} = \frac{12!}{4!}\\\\_{12}P_{8} = \frac{12*11*10*9*8*7*6*5*4*3*2*1}{4*3*2*1}\\\\_{12}P_{8} = \frac{479,001,600}{24}\\\\_{12}P_{8} = 19,958,400\\\\$

There are a little under 20 million different permutations.

<h3>Answer: 19,958,400</h3>

Side note: your teacher may not want you to type in the commas

============================================================

Part B

In this case, order doesn't matter. We could use the nCr combination formula like so.

$_{n}C_{r} = \frac{n!}{r!(n-r)!}\\\\_{12}C_{8} = \frac{12!}{8!(12-8)!}\\\\_{12}C_{8} = \frac{12!}{4!}\\\\_{12}C_{8} = \frac{12*11*10*9*8!}{8!*4!}\\\\_{12}C_{8} = \frac{12*11*10*9}{4!} \ \text{ ... pair of 8! terms cancel}\\\\_{12}C_{8} = \frac{12*11*10*9}{4*3*2*1}\\\\_{12}C_{8} = \frac{11880}{24}\\\\_{12}C_{8} = 495\\\\$

We have a much smaller number compared to last time because order isn't important. Consider a group of 3 people {A,B,C} and this group is identical to {C,B,A}. This idea applies to groups of any number.

-----------------

Another way we can compute the answer is to use the result from part A.

Recall that:

nCr = (nPr)/(r!)

If we know the permutation value, we simply divide by r! to get the combination value. In this case, we divide by r! = 8! = 8*7*6*5*4*3*2*1 = 40,320

So,

$_{n}C_{r} = \frac{_{n}P_{r}}{r!}\\\\_{12}C_{8} = \frac{_{12}P_{8}}{8!}\\\\_{12}C_{8} = \frac{19,958,400}{40,320}\\\\_{12}C_{8} = 495\\\\$

Not only is this shortcut fairly handy, but it's also interesting to see how the concepts of combinations and permutations connect to one another.

-----------------

<h3>Answer: 495</h3>

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