## iwanttogotostanford one year ago NEED HELP W/ THIS ACT PREP QUESTION: The curve y=0.005x^2-2x + 200 for 0 less than or equal to x less than or equal to 200 and the line segment from F (0, 200) to G (200, 0) are shown in the standard (x, y) coordinate plane below ( DRAWN BELOW) 1.) What is the y-coordinate for the point on the curve with x-coordinate 20? -160 -162 -164 -166 -168

1. iwanttogotostanford

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2. iwanttogotostanford

@LynFran @misty1212 @zepdrix @Nnesha please explain, i already know the answer i just need to know the process or how to solve it better later- i will be right back in ten minutes =, please help :-)

3. Nnesha

substitute x for 20 to find y coordinate

4. Nnesha

can i ask you a question i'm confused what is - is this represent negative sign ?

5. Nnesha

well i don't think tahts a negative sign anyways replace x with 20 then solve

6. iwanttogotostanford

@Nnesha no, its just like A, B, C, D

7. Nnesha

oky cool then just substitute x for 20

8. iwanttogotostanford

and then whats the second step?

9. iwanttogotostanford

@Nnesha can i ask one more question pertaining to this same problem?

10. iwanttogotostanford

@Nnesha

11. Nnesha

$$\color{blue}{\text{Originally Posted by}}$$ @iwanttogotostanford and then whats the second step? $$\color{blue}{\text{End of Quote}}$$ that's it replace x with 20 then solve

12. iwanttogotostanford

i got 162 for the first question and it was right. Can I ask you another?

13. iwanttogotostanford

@Nnesha

14. Nnesha

ye post ur questino

15. Nnesha

question

16. iwanttogotostanford

the length of this curve is longer than FG. About how many coordinate units long is FG? (this is pertaining to the problem i posted first @Nnesha