Please help to solve these question, pay attention to the open/closed intervals. True/false asap please :) thank you

Question 3 (1 point) If f is integrable on the interval [2, 8], then h f ()dx = fg f (x)dx a) True b) False Question 4 (1 point) If f is integrable on the interval [2, 8], then 2 f (x)dx = /2 f (x)dx + fi f (x )dx a) True b) False Question 5 (1 point) If f is integrable on the interval [5, 20], then (3 Foodx - /3 f ()ax + 12of (x)dx a) True b) False