These are all my last attempts, so I would really appreciate the help. Thank you!! This is all the information provided on the questions!

QUESTION ONE[has three parts]

Use the expressions for left and right sums and the table below. 0 4 8 12 16 f (t) 29 26 25 24 22 (a) Ifn = 4, what is At? What are to. (1, 12, 13, t4? What are f (to), f (t1), f (t2), f (13), f (14)? At = to = f (to) = i f (1 1 ) = i 12 f (12 ) = i 13 = f (13) = if (13) = 14 f (14 ) = eTextbook and Media (b) Find the left and right sums using n = 4. i Left sum = i Right sum =(c) If n = 2, what is At? What are to, 1, t2? What are f (to), f (t1), f (12)? At = to = f (to) = f (1 1) = i by = f (12 ) = i eTextbook and Media (d) Find the left and right sums using n = 2. HI Left sum E i Right sum =Roger runs a marathon. His friend Jeff rides behind him on a bicycle and clocks his speed every 15 minutes. Roger starts out strong, but after an hour and a half he is so exhausted that he has to stop. Jeff's data follow: Time since start (min) 0 15 30 45 60 75 90 Speed (mph) 13 12 10 10 7 6 0 (a) Assuming that Roger's speed is never increasing, give upper and lower estimates for the distance Roger ran during the first half hour. Lower estimate = Upper estimate = i eTextbook and Media(b) Give upper and lower estimates for the distance Roger ran in total during the entire hour and a half. Lower estimate = i Upper estimate = i eTextbook and Media (c) How often would Jeff have needed to measure Roger's speed in order to find lower and upper estimates within 0.1 mile of the actual distance he ran? Round your answer to the nearest integer. i seconds eTextbook and MediaFind the difference between the upper and lower estimates of the distance traveled at velocity f(t) = 97 - 12 on the interval 6