If U = {1, 3, 5, 7, 9, 11, 13}, then which of the following are subsets of U. A = {0}
B = {2, 4}
C = {1, 9, 5, 13}
D = {2, 3, 4, 5}

What is the surface area of the sphere?

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The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.