Use Green's Theorem to evaluate the line integral (y − x)dx + (2x − y)dy

C

for the given path.
C: x = 2 cos(), y = sin(), 0 ≤ ≤ 2

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of