## anonymous 5 years ago I still need help with the following problems...

1. anonymous

2. anonymous

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

3. TuringTest

I can't open the file...

4. anonymous

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

5. 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=___

6. anonymous

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

7. 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

8. anonymous

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

9. anonymous

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

10. anonymous

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

11. 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.

12. anonymous

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

13. anonymous

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

14. anonymous

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

15. anonymous

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

16. Mertsj

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

17. anonymous

no...

18. Mertsj

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

19. anonymous

so i would get plus minus radical 3

20. Mertsj

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

21. 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?

22. anonymous

distance formula

23. Mertsj

yep

24. anonymous

what was that again?

25. anonymous

cant keep track of all the formulas

26. Mertsj

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

27. anonymous

Thanks a lot!

28. Mertsj

|dw:1327017935457:dw|

29. Mertsj

Did you get it

30. anonymous

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

31. anonymous

im using my calc btw

32. anonymous

ok nvm