Brainliest! pls !
what is the equation of the quadratic graph with a focus of (4, −3) and a directrix of y = −6?
a. f(x)=1/6x^2+4/3x+11/6
b. f(x)=3/50x^2+11/25x+3/5
c. f(x)=2/50x^2+11/25x+2/5

Ahigh-altitude spherical weather balloon expands as it rises, due to the drop in atmospheric pressure. suppose that the radius r increases at the rate of 0.02 inches per second, and that r = 36 inches at time t = 0. determine the equation that models the volume v of the balloon at time t, and find the volume when t = 360 seconds. v(t) = 4π(0.02t)2; 651.44 in3 v(t) = 4π(36 + 0.02t)2; 1,694,397.14 in3 v(t) = four pi times the product of zero point zero two and t to the third power divided by three.; 4,690.37 in3 v(t) = four pi times the quantity of thirty six plus zero point zero two t to the third power divided by three.; 337,706.83 in3