I would like to know how to solve the following calculus questions.

tempt=1324395&page=1 O c. 0.6x0.5 -0.4 0.7 0.8 O d. 0.3x, 0.5 -0.4 0.7 0.8 QUESTION 8 If Not yet answered 0.5 0.6 0.7 0.8 f(x1, X2, X3, X4) = X1 X2 X3 Marked out of 1 then Flag f33 = question Select one: O a . -0.21x1 x2 x0.6x70.7 x 0.8 O b . -2.1xx9.6x-13 0.8 X4 O c. 0.5 0.6 -1.3, 0.8 -0.21x1 X2 X3 O d. 0.7x x2 9.6x50.3 0.8 ON 9 iswered ( xzy dx dy = of O wattempt=1324395&page=1 O d. 9 QUESTION 7 If Not yet answered f(X1, X2, X3, X4) = x0-5x0.6, 0.7 0.8 Marked out of 1 then f12 = Flag question Select one: O a. 0.6, 0.7 0.8 0.5x X2 X3 X4 O b . 0.25x, 15x-0.4 0.7 0.8 O c. x-0.4 0.7x4 0.6x1 X2 O d. 0.3x, 0.5x50.4x9.7x TION 8 If answered f(X1, X2, X3, X4) = x9.5x0.6*0.7x 0.8 out of 1 then f33 = O35#92 QUESTION 3 Given Not yet answered f(x1, X2) = x x2 Marked out of 1 Flag If H is the Hessian matrix, then | Hil = question Select one: 0 O a. 1 -1/2 1/2 7*1 O b. 1 -3/2 1/2 4 x 1 X2 O c. 1 1/2 X7 -3/2 O d. QUESTION 4 ENG W US 16 18 6\fO C. 1 -3/2 1/2 4 x 1 X2 O d. QUESTION 2 Fill in the blank. Not yet answered Marked out of 1 The function Flag question f (x1, X2) = X1 X2 ,xi ER+, i= 1,2 is Select one: O a. strictly convex b. weakly convex c. strictly concave O d. weakly concave ESTION 3 Given O W ENG US 17 144