Question

I still need help with the following problems...

Answer 1

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

Answer 2

I can't open the file...

Answer 3

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

Answer 4

#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=___

Answer 5

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

Answer 6

#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

Answer 7

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

Answer 8

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

Answer 9

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

Answer 10

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.

Answer 11

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

Answer 12

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

Answer 13

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

Answer 14

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

Answer 15

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

Answer 16

no...

Answer 17

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

Answer 18

so i would get plus minus radical 3

Answer 19

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

Answer 20

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?

Answer 21

distance formula

Answer 22

yep

Answer 23

what was that again?

Answer 24

cant keep track of all the formulas

Answer 25

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

Answer 26

Thanks a lot!