Please help me with these questions.

I am really stuck with them and cannot figure out the right way to solve them. I tried everything and need a little guidance on them

Thank you very much in advance!

This Question: 1 pt 10 of 10 (3 complete) Find the first partial derivatives of the following function. g(w,x,y,z) = cos (7w + x) sin ( - 3y - 5z) 9w = 9x = gy = 97 = Enter your answer in each of the answer boxes.This Question: 1 pt 6 of 10 (2 complete) At what point(s) of RZ is the following function continuous? sin (y + x) Choose the correct answer below. O A. {(x,y) : sin (y + x) #0} O B. {(x,y) : x =y} O C. {(x,y) : sin (y + x) = 0} O D. (0,0) O E. The function is continuous at any point in R2 OF. The function is not continuous at any point in R2. Click to select your answer.Find the four second partial derivatives of the following function, f(x,y) : 3,"1 cos 5x Enter your answer in each of the answer boxes. 8 of 10 (3 complete) Verify that f for the following function. fxv: vx x, y): 2x3 y5 7 5x4y6 Enter your answer in each of the answer boxes. This Question: 1 pt 9 of 10 (3 complete) Find the first partial derivatives of the following function. F(u, V,W) = U v + 7w Fu =] Fv =1 FW = Enter your answer in each of the answer boxes