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- anonymous

I still need help with the following problems...

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- anonymous

##### 3 Attachments

- anonymous

If you can't open them, I'll type them out for you. My HW website won't let me copy and paste.

- TuringTest

I can't open the file...

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## More answers

- anonymous

evidently the line through (7,7) meets y = x at (7,7) !!

- anonymous

#15) Find the intersection of the line through points (7,7) and (4,2) with the line y=x.
The point of intersection is (A,B) where
A=___ B=___

- anonymous

\[x^2-3\] intersect the x axis at
\[\sqrt{3}\] and
\[-\sqrt{3}\] and the distance between these to points is
\[2\sqrt{3}\]

- anonymous

#15
not to be snarky, but it is asking who is buried in grant's tomb. if it goes through (7,7) that is where y = x

- anonymous

for #20 you have to decide which rule to use. since
\[-1\leq 2\] you know
\[f(-1)=2\times -1=-2\]

- anonymous

since
\[x>2\] =you use
\[f(3)=6\times 3^2+3+4\]

- anonymous

and since
\[2 \leq 2\] is true you use
\[f(2)=2\times 2=4\]

- anonymous

yeah, i knew that i had to do that for 20 but i got the wrong answer for some reason...
for 18, i dont know why the answer is not 3 or 4.

- anonymous

because you are asked for the distance between
\[(-\sqrt{3},0)\] and
\[(\sqrt{3},0)\] and that is
\[2\sqrt{3}\]

- anonymous

o sorry, didnt see u solved #18 too cause u didnt put the # in front of it.

- anonymous

so how did u get those numbers for #18? im a little confused on that

- anonymous

and for #20 i got -2, 61, and 30 but those are wrong... why?

- Mertsj

Do you know how to find the points where the parabola crosses the x axis?

- anonymous

no...

- Mertsj

If a point is on the x axis, the y value is 0 so set y = to 0 and solve

- anonymous

so i would get plus minus radical 3

- Mertsj

Yes. So the parabola crosses the x axis at (sqrt3,0) and (-sqrt3,0)

- Mertsj

But the question doesn't ask for the two points. It asks for the distance between the points. Do you know how to find the distance between two points?

- anonymous

distance formula

- Mertsj

yep

- anonymous

what was that again?

- anonymous

cant keep track of all the formulas

- Mertsj

\[d=\sqrt{(x _{2}-x _{1})^{2}+(y _{2}-y _{1})^{2}}\]

- anonymous

Thanks a lot!

- Mertsj

|dw:1327017935457:dw|

- Mertsj

Did you get it

- anonymous

im getting a decimal when i subtract - radical 3 and radical 3

- anonymous

im using my calc btw

- anonymous

ok nvm

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