I am super stuck with these problems. Could you please give me some guidance so I can understand them better?

Thank you in advance!

15.3.48-Setup & Solve Verify that fxy = fux for the following function. f(x, y) = 7xay3- 3x56 fx = 28x3y3 - 15x46 fy = 21x4y2 - 18x5 y5 fxy = fyx =0 10 vi V More Enter your answer in the answer box and then click Check Answer. All parts showing Clear All15.3.57 Find the first partial derivatives of the following function. F(u,V,W) = Su V + 4w 6 V + 4w Fv =] Enter your answer in the answer box and then click Check Answer. part Clear All15.3.60 Find the first partial derivatives of the following function. g(w,x,y,z) = cos (9w - x) sin ( - y - 6z) 9w = 9 sin (y + 6z) sin (9w - x) 9x =1 Enter your answer in the answer box and then click Check Answer. parts Clear All15.3.62 Find the first partial derivatives of the following function. F(w,x,y,z) =8w15x + 9y + 4z Fw = 815x + 9y + 4z Fx =] Enter your answer in the answer box and then click Check Answer. parts Clear All