Help me with that

7. [-/1.33 Points] DETAILS SCALC9 3.4.011. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the limit. (If the limit is infinite, enter 'co' or '-co', as appropriate. If the limit does not otherwise exist, enter DNE.) lim 2tz+ t t- -0 +3 - 8t + 1 8. [-/1.33 Points] DETAILS SCALC9 3.4.013. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the limit. (If the limit is infinite, enter '' or '-co', as appropriate. If the limit does not otherwise exist, enter DNE.) r- p3 lim 1-+ 00 7- 12+ 5+3 9. [-/1.33 Points] DETAILS SCALC9 3.4.016. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the limit. (If the limit is infinite, enter '' or '-co', as appropriate. If the limit does not otherwise exist, enter DNE.) lim (U2 + 1) (542 - 1) U - -20 ( 42 + 4) 2 10. [-/1.33 Points] DETAILS SCALC9 3.4.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the limit. (If the limit is infinite, enter 'co' or '-co', as appropriate. If the limit does not otherwise exist, enter DNE.) lim Vx + 3x2