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Mathematics 15 Online
OpenStudy (anonymous):

What do I need to do first?

OpenStudy (anonymous):

OpenStudy (anonymous):

if you cant open the file, let me know please

hero (hero):

0

OpenStudy (anonymous):

The graph of the function f(x) is given above. Find f'(1/2).

hero (hero):

f'(1/2) = 0

OpenStudy (anonymous):

can you explain please

OpenStudy (anonymous):

i dont see why

OpenStudy (anonymous):

It is not 0

OpenStudy (anonymous):

answer is not zero

OpenStudy (anonymous):

Intercepts are not clear Slope is constant i.e f'(x) is constant

OpenStudy (anonymous):

?

hero (hero):

Yeah, it's not zero

OpenStudy (anonymous):

Ans is (y-intercept/x-intrecept)

OpenStudy (anonymous):

which intercepts?

OpenStudy (anonymous):

x and y

OpenStudy (anonymous):

yes i know, but at which point

OpenStudy (anonymous):

?

hero (hero):

Sorry, you're right, it's not zero. What you have to do is find the slope of the line first. The slope of the line = the derivative.

OpenStudy (anonymous):

thats what i was thinking too

OpenStudy (anonymous):

its not

OpenStudy (anonymous):

we have to do more than find the slope dont we?

hero (hero):

(8-4)/(1-.25) = 4/(3/4) = 16/3 If that's not it then I don't know what is..

OpenStudy (anonymous):

no its not

hero (hero):

:/

hero (hero):

you typed 16/3 ?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

i think its 3/1 so 3

OpenStudy (anonymous):

but its not

OpenStudy (anonymous):

rise over run

hero (hero):

I just looked over the graph, the lines don't match up the way I thought they did. This question is pretty whack.

OpenStudy (anonymous):

haha

hero (hero):

Are you still trying to find the answer to it? I want to give it one last shot

OpenStudy (anonymous):

yes i am lol

hero (hero):

Try 12.5

OpenStudy (anonymous):

nope

OpenStudy (anonymous):

not the answer

hero (hero):

3.125 Try that

hero (hero):

If that isn't it, I quit

OpenStudy (anonymous):

its not. thanks for trying to figure it out though.

hero (hero):

Ridiculous

OpenStudy (anonymous):

the answer is 5. i figured it out.

hero (hero):

What did you do? Keep guessing until you got it?

OpenStudy (anonymous):

no

OpenStudy (anonymous):

did rise over run

OpenStudy (anonymous):

i did it wrong at first

OpenStudy (anonymous):

it goes up by 5 and over 1

OpenStudy (anonymous):

5/1 = 5

hero (hero):

How'd you figure that out?

OpenStudy (anonymous):

i have notes from class

hero (hero):

Actually, that's a shortcut way to do it. I remember now that you're supposed to use the x and y intercepts to do it if it crosses both axes. The x intercept = .6 The y intercept = 3 So the slope is rise/run = y/x = 3/.6 = 5 I completely bombed this question.

OpenStudy (anonymous):

at least you tried, thanks

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