7. a. if ab = 5y - 4, bd = 7y + 3 and ad = 20y - 9, find the value of y. b. use the value of y, to find ab, bd and ad. 8. use the figure below to answer questions 8-10. point b is the midpoint of segment a c.. a a. find x if ab = 4x and bc = 2x + 10. b. use the answer for x to find the values of ab and bc. 9. a. find x if ac = 3x - 1 and bc = 12 - x. b. use the answer for x to find the value of ab. 10. a. is it possible for ab = 10, bc = 2x + 5 and ac = 5x, given that point b is the midpoint? b. why or why not?

7. y = 1, AB = 1, BD = 10 and AD = 11

8. x = 5, AB = 20 and BC = 20

9. x= 5 and AB = 33

10. No, because AC = 12.5 while AB + BC = 20 (they should equal the same and they don't.)

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).