19. let f(x, y) = and let c be the upper half of the unit circle. which of the following is not equivalent to sf. dr? xydx + x²ydy b) sint cost dt dr 20. which theorem is useful in physical problems which require the computation of the net total flux of a vector field across a closed surface? a) the fundamental theorem for line integrals b) green's theorem c) the divergence theorem d) stokes' theorem

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Type the correct answer in each box. use numerals instead of words. the average number of subscribers to an online magazine each year from 2010 to 2015 is given in the table below. the average number of subscribers to the online magazine in 2010 was the percent increase in the average number of subscribers in 2011 to the average number of subscribers in 2012 was %. the maximum average number of subscribers to the online magazine in the years shown was

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?