Review

zee-f · 2011-09-21 08:59:29

wow thank you......
p(purple)=2/16

p(green)=5/16

p(yellow)=1/16

p(red)=2/16

p(orange)=3/16

p(blue)=3/16

Bob · 2011-09-21 09:01:24

Excellent, all correct.

Now look at the histogram (bar chart).

Does it show these answers?

Bob

zee-f · 2011-09-21 09:04:09

nope ............ so its a theoretical ?

Bob · 2011-09-21 09:07:55

They don't agree, so that much is right. But in post # 26, what were you working out, theoretical or experimental ?

Bob

zee-f · 2011-09-21 09:10:57

experimental

Bob · 2011-09-21 09:13:19

You looked at the picture of the spinner, counted how many 1/16 there were for each colour and worked out probabilities from that alone.

You just used the spinner. Is that theory or experiment ?

Bob

zee-f · 2011-09-21 09:31:52

experimental probability is when am using desired outcome ooooh ok so what i did was theoretical

Bob · 2011-09-21 09:36:09

Yes, you calculated the theoretical probabilities.

Then you compared those with the histogram and the two weren't the same.

So the histogram must be ........... what?

Bob

zee-f · 2011-09-21 09:36:33

so my histogram is experimental i had them mixed lol

Bob · 2011-09-21 09:38:53

Yes, hurrah! You've got there.

And I seem to remember that your answers to 3 4 and 5 were correct, so that's all done.

Bob

zee-f · 2011-09-21 09:42:58

thank you

zee-f · 2011-09-21 09:44:51

i still have more on simplifying and finding the domain i did 2 of them wondering if i did them right

Bob · 2011-09-21 09:51:16

Do you want to post them now, or wait until tomorrow?

Bob

zee-f · 2011-09-21 09:56:36

am ganna post the 2 now and the rest tomorrow

Bob · 2011-09-21 09:58:48

OK, good scheme.

I'll look at those two and then it'll be time for bed for me.

I'll be back on-line tomorrow in about 9 hours, but post the two answers now.

Bob

zee-f · 2011-09-21 09:59:01

#6-

(x^2-x-6) factored is ganna be (x+2)(x-3)

x^2-9x+18 factored is ganna be (x-6)(x-3)

so

my answer is

Bob · 2011-09-21 10:01:18

Yes that's correct!

Bob

zee-f · 2011-09-21 10:03:28

yay heres the second

#7-
find the domain of

x^2-9x+18=0

(x-6)(x-3)=0

(x-6)=0
x=6

(x-3)=0
x=3

domain = all real numbers except (6,3)

x≠6,3

Bob · 2011-09-21 10:06:59

Yes, that's good too.

Well done!

Bob

zee-f · 2011-09-21 10:14:21

thank you u tooo welll done for alll your great work and explanation

Bob · 2011-09-21 10:16:45

You're welcome. Good night.

Bob

zee-f · 2011-09-21 10:17:34

good night

zee-f · 2011-09-22 00:13:40

hi guys;

Am spouse to simplify this rational equation , i did it in to ways i was wondering witch way was correct

the original equation is simplify

the first way i did it was

the second way was

bobbym · 2011-09-22 00:21:15

Hi;

First way is correct!

zee-f · 2011-09-22 00:26:36

thank you bobbym.....i did number 9 to hope its correct

#9-simplify

6x^2-7x-5= (2x+1)(3x-5)

Math Is Fun Forum

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