Test due in 2 hours! Will give good review and brainliest. :)

circumference =9 volume = 972

Step-by-step explanation:

circumference of sphere =2 π r =18π ; r= 18π/2 π =9

Volume =4/3 *π r^3 =π* 4/3 *9*81 =4*3*81 π =12*81π = 972π Cubic inches

Volume of sphere is=972π

may i be marked brainliest?

option: d is correct

step-by-step explanation:

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0