A graph has Quantity supplied on the x-axis, from 0 to 50 in increments of 10, and price in dollars on the y-axis, from 0 to 18 in increments of 2. A line that represents supply has a positive slope and a line that represents demand has a negative slope. The lines intersect each other at a point. Where is the equilibrium point on this graph?

where the demand curve begins and the supply curve ends
where the demand curve and the supply curve cross each other
where the supply curve begins and the demand curve ends
where both curves begin heading downward

Find the roots of the equation below. x^2 - 6 + 9 = 0

In a column proof the right column states your reasons

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