Section+9.1

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8. v: (0,0) f:(0, -1/8) D: y=1/8

graph: opens downward

checked by olivia mohle

10. x= 1/3y^2 vertex: (0,0) focus: (3/4, 0) directrix: x= -3/4 worked by Erica Molson checked by Gina Marucci

25. Opens up -> y = ax^2 (3,6) 6 = 9a -> a = 2/3 y= 2/3x^2

26. opens left -> x = -ay^2 (-2, 6) -2 = -36a -> a = 1/18 x = -1/18y^2

worked by Jack Bentele checked by Eva Hogan

29. y^2=-8x 30. y=1/4x^2 worked by shannon fenton checked by ellie tendall

31. y=1/4x^2 32. y=-1/12x^2 Worked by Henry Bettencourt

33. X=-1/8Y^2 34. X=1/12Y^2 worked by Ellen Wagner

35. x=ay^2 4=a(6)^2 a=4/36=1/9 x=1/9y^2 36. y=ax^2 -3=a(-3)^2 a=-3/9=-1/3 y=-1/3x^2 Worked by Lindsey Koszela Checked by Jake Duffy 55. Checked by philip Sweet, not here 56. A. y=a(x^2) +b 0= a(16^2) + .4 -.4= a(256) a= -1.56E -3 y= -1.56E-3(x^2) B. .3= -1.56E-3(x^2) -192.308=x^2 -192.308^1/2 x= +/- 13.87 ft Worked by Shannon McPhillips (SORRY zack had major problems with Wiki spaces) 56. not here checked by zack barth 57. x = 640y^2 Worked by Michael Kelly checked by emily othold

Worksheet 1. a. x=1/16y^2 b. 3 33/64ft worked by Hikari Suzuki

checked by sheridan gabrisch

2. a) x=(5/9)y^2 b) 3.52 ft Worked by Bibi Rajeh

3. y=ax^2 (300,80) 80 = a(300)^2 a = 80/90000 = 8/9000 y = 8/900(150^2) = 20 ft workd by michele centineo Correct! Checked by Samantha Ehlinger

5. 10'= 24.306ft 20'= 18.750ft 30'= 7.639ft Worked by Cymphoni Pringle

not here. checked by Grant Lund