I need help with this please

Question 6 of 28 - /1 8 The table below shows the total amount spent, in billions of dollars, on tobacco products in the US. Year 1987 1988 1989 1990 1991 1992 1993 Spending 35.6 36.2 40.5 43.4 45.4 50.9 50.5 Find the average rate of change in the amount spent on tobacco products between 1988 and 1993. Give units. Round your answer to one decimal place. The average rate of change in the amount spent on tobacco products between 1988 and 1993 is During this six-year period, is there any interval during which the average rate of change was negative? If so when? If not, enter NA in both entry areas. From