From the equation of a parabola identify the focus and directrix:

y^2 - 8x + 10y + 9 = 0

the square root of what number? if you add that, then someone will probably answer the question.

y < -3

step-by-step explanation:

-3y - 2 > 7

-3y -2 + 2 > 7+2

-3y > 9

-3y/-3 < 9/-3   (change the inequality sign when multiplying or dividing by a negative number)

y < -3

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64