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Look,

There are 4 choices for the first hour.

one subject is now chosen so there are 3 subjects left.

There are 3 subjects fo the second hour

There are 2 left for the 3rd hour

and only one left for the last hour.

so

4*3*2*1 = how many possibilities there are

What does 4*3*2*1 equal?

Now forget about formulas and tell me how to do part b.

Forget about formulas for the moment.

EXPLAIN to me why 24 is the correct answer for part a!

a) P(4,4)= 4!/(4-4)!= 4!/0!= 24 

Whenever I attempt part b it says my answer is wrong. 

Well show me how you did part a?  And tell me if you really understand? 

Part b is exactly the same idea.

What do you think the answer is guest?  What was the maximum you could work out?

Hi and thank you for your help, I already know that the answer to part a is 24 I only need help with part b. 

thanks guest, I hope you understand it :)

Well there are 4 possibilities for the first hour.

Now one class has been taken, so, how many possibilities are there for the second hour?   etc.

What do you think you should do to answer part a ?

if you can do that, then you can also have a shot at part b.

Other answerers:

Please allow Bleh674 to respond with an attempt before giving more help.

Melody

12475.6666667

The smallest N = 6, because:

7 + (30 x 6) =187 =11 x 17 

z = 2 - 7i

It is 9.3*10^4

why?

Well In scientific notation, The first number (Before the decimal must be less than 10) any other number is written after the decimal if there is zeros, we just write 10^n where n is an integer

So general rule

A*10^n 

where 1

In parralelogram ABCD

AD=10 so BC=10 

Area is equal to base*Height

Notice that EN is a height on FG, we already know FG=BC=AD=10 

so 10*EN=112

EN=112/10=11.2

Repost: Have you noticed how Macabre likes to f u ck with people?

He especially likes to f u ck with those who do his homework for him.

thank you!!!