Firstly I let the numbers be m,m+1,m+2......m+19. Then I added all the numbers and put variables and constant at different portions and added all variables which were 20(m) and all constant were equal to 189...so the answer is 20m+189
The rules of significant figures are: 1. all non zeros are significant. 2. trailing zeros are significant. 3. zeros between non-zeros are signifincant. Hence, applying these to the given. A. 4 sig figs B. 1 sig fig C.6 sig figs D.1 sig fig
