IV$.$ Matching

$q,1.$ Double Integral

a$.$ For $f(x,y)$ it is $fxy(x,y)$

$q,2.$ Improper Double Integral

b$.$ of unbounded region or function

$q,3.$ Function of two variables

c$.$ Integral of an integral

$q,4.$ Triple integral

d$.$

$q,5.$ Type I Region

e$.$ Begins and ends at same point

$q,6.$ Type II Region

f$.1{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}$

$q,7.$ Iterated integral

g$.w=f(x,y,z)$

$q,8.$ Mixed partial derivative

h$.Z=f(x,y)$

$q,9.$ Function of three variables

i$.$ Lies between $2$ horizontal lines

$q,10.$ Closed curve

j$.$ Lies between $2$ vertical lines