Let Si be the upper half of the unit sphere oriented upwards and let S2 be the lower half of the unit sphere also oriented upwards. Suppose that F is a differentiable vector field for which div F is constantly equal to 2.
For which of the following expressions can you determine the exact value just based on the given information?
a. ols, F. ds
b. Ols, F. dS + Ws, F.ds
c. Ws, F. ds
d. olls, F. dS – ls, F.ds

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality