1.)
https://www.chegg.com/homework-help/questions-and-answers/consider-boundary-c-region-r-xy-plane-given-x-2-y-2-lessthanorequalto-4-x-greaterthanorequ-q15339043?trackid=def802cf2207&strackid=eb9b029e337b&ii=1

2.)
https://www.chegg.com/homework-help/questions-and-answers/let-s-surface-tetrahedron-vertices-0-0-0-4-0-0-0-2-0-0-0-1-unit-outward-normal-vector-hat--q15339055?trackid=5dab9f1e19a8&strackid=f1819f60823b&ii=1

3.)
https://www.chegg.com/homework-help/questions-and-answers/curvilinear-system-coordinates-u-v-w-related-cartesian-coordinates-x-y-find-unit-vectors-e-q31788508?trackid=67c75efb6bf2&strackid=d85f37742684&ii=3

4.)
https://www.chegg.com/homework-help/questions-and-answers/4-curvilinear-system-coordinates-u-v-w-related-cartesian-coordinates-x-y-z-find-unit-vecto-q24234420?trackid=67c75efb6bf2&strackid=d85f37742684&ii=4

5.)
https://www.chegg.com/homework-help/questions-and-answers/question-assume-x-y-elementof-r-real-numbers-z-elementof-c-complex-numbers-squareroot-1-sk-q15339073?trackid=9d1c43fbf92e&strackid=669dbf165b90&ii=4

THANK YOU!!!