Y=-1/3(x-12)^2+9
find the focus, directrix, vertex, and axis of symmetry.

Select the quadratic that has root x = 8 and x = -5

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove