Hi I need help with questions 11-14 please

11. [-12 Points] DETAILS WANEFMJACTII 15.3.014. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Locate and classify all the critical points of the function.(If an answer does not exist, enter DNE.) g{x,y):2xz+x+3y2y1 (x, y) : ( l ) Select Need Help? 12. [I1 Points] DETAILS WANEFMAC7 4.2.035.Ml. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Use Gauss-Jordan row reduction to solve the given system of equations. (If there is no solution, enter N0 SOLUTION. If the system is dependent, express your answer using the parameters x, y, 2, and/or w.) x+ y+52 y+22+ w x+ y+52+ w x+2y+7z+2w=1 W(S) ~eed Help? 6 6 6 2 13. [5 Points] DETAILS WANEFMAC7 15.3.023.Ml. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Locate and classify all the critical points of the given function. (HINT [See Example 2.] Order your answers by their ordered pairs, from smallest to largest x, then from smallest to largest y. If an answer does not exist, enter DNE.) for, y} = x2 + 211/2 + By2 m. - 0:) W. M = (i:) 4...... .. - 0:) Need Help? 0 O 14. [I4 Points] DETAILS WANEFMAC? 15.1.025. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Use either a graphing calculator or a spreadsheet to complete the table. Express all your answers as decimals rounded to four decimal places