anonymous
  • anonymous
I still need help with the following problems...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anonymous
  • 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
  • TuringTest
I can't open the file...

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anonymous
  • anonymous
evidently the line through (7,7) meets y = x at (7,7) !!
anonymous
  • 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
  • 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
  • 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
  • anonymous
for #20 you have to decide which rule to use. since \[-1\leq 2\] you know \[f(-1)=2\times -1=-2\]
anonymous
  • anonymous
since \[x>2\] =you use \[f(3)=6\times 3^2+3+4\]
anonymous
  • anonymous
and since \[2 \leq 2\] is true you use \[f(2)=2\times 2=4\]
anonymous
  • 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
  • anonymous
because you are asked for the distance between \[(-\sqrt{3},0)\] and \[(\sqrt{3},0)\] and that is \[2\sqrt{3}\]
anonymous
  • anonymous
o sorry, didnt see u solved #18 too cause u didnt put the # in front of it.
anonymous
  • anonymous
so how did u get those numbers for #18? im a little confused on that
anonymous
  • anonymous
and for #20 i got -2, 61, and 30 but those are wrong... why?
Mertsj
  • Mertsj
Do you know how to find the points where the parabola crosses the x axis?
anonymous
  • anonymous
no...
Mertsj
  • Mertsj
If a point is on the x axis, the y value is 0 so set y = to 0 and solve
anonymous
  • anonymous
so i would get plus minus radical 3
Mertsj
  • Mertsj
Yes. So the parabola crosses the x axis at (sqrt3,0) and (-sqrt3,0)
Mertsj
  • 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
  • anonymous
distance formula
Mertsj
  • Mertsj
yep
anonymous
  • anonymous
what was that again?
anonymous
  • anonymous
cant keep track of all the formulas
Mertsj
  • Mertsj
\[d=\sqrt{(x _{2}-x _{1})^{2}+(y _{2}-y _{1})^{2}}\]
anonymous
  • anonymous
Thanks a lot!
Mertsj
  • Mertsj
|dw:1327017935457:dw|
Mertsj
  • Mertsj
Did you get it
anonymous
  • anonymous
im getting a decimal when i subtract - radical 3 and radical 3
anonymous
  • anonymous
im using my calc btw
anonymous
  • anonymous
ok nvm

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