Green's theorem says the circulation of
along the rectangle's border
is equal to the integral of the curl of
over the rectangle's interior
.
Given
, its curl is the determinant

So we have

Answer:
a=5
x=4
ax+3=23
5×4+3=23
Step-by-step explanation:
Answer: They cost the same amount.
Step-by-step explanation:
35(0.20)=7
35-7=28
40(0.30)=12
40-12=28
28=28
Opposites.
Their sum is zero so they are called opposites.