7a. Given b = 25, A = 77 degrees and c = 30, use the Law of Cosines to solve for a. Round your answer to the nearest tenth. 8a. Given a = 15, b = 10, and c = 8, use the Law of Cosines to solve for C. Round your answer to the nearest degree.

9a. Given a = 3, b = 4 and c = 5, use the Law of Cosines to solve for C. Round your answer to the nearest degree.

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