need help with part b please

4.1 Homework A 4.1 Homework-Areas and D x Mathway | Calculus Problem G Repeat part (a) using left e x *[Solved] 1a.Estimates the a x G Repeat part (a) using left ex C webassign.net/web/Student/Assignment-Responses/submit?dep=26874125&tags=autosave#question3391248_3 OGNK 4. [5/6 Points] DETAILS PREVIOUS ANSWERS SCALC8 4.1.505.XP. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) Estimate the area under the graph of f(x) = 20vx from x = 0 to x = 4 using four approximationg rectangles and right endpoints. (Round your answers to four decimal places.) R4 = 122.9253 Sketch the graph and the rectangles. y 40 30 f( x) =20 Vx 30 f( x) = 20 Vx 20 20 10 10 O 40 40 30 f( x) = 20 Vx 30 f( x) = 20 Vx 20 20 10 10 2 Is your estimate an underestimate or an overestimate? overestimate O underestimate (b) Repeat part (a) using left endpoints. L4 = 0.7813 JX Sketch the graph and the rectangles