7. Keeping in mind that the data in Column 4 represents the cumulative amount of rise in sea level since the baseline measurement in 1960, a) Fill in the blanks in Column 4 of Table 1 on page 4 using the "sum of the areas of the rectangles" method described on the previous page. b) The (Column1, Column4) data point of (1974, ) shows that the sea level rose/fell by a total of mm since 1960. (Circle one) c) The (Column1, Column4) data point of ( ,6.7) shows that during the period between and , the sea level rose/fell by (Circle one) a total of mm. d) What is the total cumulative amount of rise in sea level between 1960 and 2000? mm