19. [0.22/0.33 Points] DETAILS PREVIOUS ANSWERS SCALCET8 5.2.002. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER If f(x) = cos(x) OSX S 37/4 evaluate the Riemann sum with n = 6, taking the sample points to be left endpoints. (Round your answer to six decimal places.)15. [-/0.33 Points] DETAILS SCALCET8 5.1.JIT.003. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the sum. 2k - 1 K = 1 Need Help? Watch It 16. [-/0.33 Points] DETAILS SCALCET8 5.1.JIT.004. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A partial sum of an arithmetic sequence is given. Find the sum. (4+ 0.28k) 0 Need Help? Watch It 17. [-/0.33 Points] DETAILS SCALCET8 5.1.JIT.006.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the sum. Need Help? Watch It Master It10. [-/0.33 Points] DETAILS SCALCET8 5.1.026. MY NOTES ASK YOUR TEACHER (a) Use the definition to find an expression for the area under the curve y = x from 0 to 1 as a limit. lim n - 0o E i = 1 (b) The following formula for the sum of the cubes of the first n integers is proved in Appendix E. Use it to evaluate the limit in part (a). 13 + 23 + 35 + ... + 3 = n( n + 1)12 220. [0.17/0.33 Points] DETAILS PREVIOUS ANSWERS SCALCET8 5.2.003. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER If f(x) = x2 - 4, 0