imaanie imaanie 02-03-2021 Mathematics contestada 4. Which of these answers are obviously incorrect? Use estimates to identify them. Show how you estimated the answers. a) 37 x 21 = 777 b) 6 091 = 33 = 1 845 c) (816 +214) = (103 + 419) = 1,97 d) 11 X 603-3 x 240 = 519