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|dw:1347078037836:dw|

Have you graphed the function yet?

yea as the time increases the volume decreases!

y did u picked the time 20?

Because it is the next point
P = (15,250)
Q = (20,111)
R = (25,28)
Get it?

okay so i thought we hv to pick the closest point to 15

so is the slope -27.8?

I will assume you have calculated it correctly

okay so how do i find the other part of this question?

Find the slope of Point PR

-22.2

Okay, now find the average of both both slopes

how? by subtracting them?

then dividing by 2

-2.8?

That's not what I got

like: -27.8-(-22.2)/2

No, not like that

is it -25?

Yes

great so this the slope of the tangent line at P!

It's an "estimate"

lastly how do i use a graph of the function to estimate the slope of the tangent line at P?

(This slope represents the rate at which the water is flowing form the tank after 15 mins)

I would use rise over run to find the slope.

u mean delta y/delta x?

hmm in this case how can I find my delta y/x values?

By using points on the tangent line. You have to find them for yourself.

Actually, use the tangent line approxmation formula

which is?

Well, that depends on how far along you are.

like i can pick (15,250) ; (14.09, 249.99)

|dw:1347079571561:dw|

Then you will have two points on the tangent line. Use those two points to find the slope

|dw:1347079627933:dw| something like this

Yeah, something like that. But use graph paper.

okay

Use the good kind with the smaller squares.

okay and after doing it lets say my values are 14.009 and 249.001

i just divide them out?

I just told you what to do. Now you have just came up with random values that don't mean anything.

alright well thanks for your help. I appreciate it..

Should I repeat the steps again?

no its fine thank you once i come up with the accurate values i will ask u again.!

thanks ^^

When I say draw tangent line, I mean a straight line using a ruler

okay, gotch ya..

|dw:1347081039622:dw| so this is how it looks like on my graph paper

|dw:1347081239380:dw| a lil more like this!

yea i am finding the values now. and i hope i found the precise one!

You already know what it should be close to.

yea