Calculus Questions 3, 4, and 5

3. 4. 5. [-120 points] DETAILS SCALCET8 5.2.511 .xp. Evaluate the integral by interpreting it in terms of areas. IXI dx Need [-120 points] If DETAILS = 12 and SCALCET8 5.2.51S.XP.Ml. = 3.8, find Nx) dx. Need Help? [-120 points] DETAILS SCALCET8 5.2.049. MY NOTES MY NOTES MY NOTES PRACTICE ANOTHER PRACTICE ANOTHER PRACTICE ANOTHER If = 31 and g(x) dx = 18, find C3f(x) + 4g(x)] dx. Need Help?