The table shows how the radioactivity in iodine-131 decreases over time. The initial amount is 2.00 grams. Radioactivity in Iodine-131
Day 1 2 3 45 7 8
Grams 1.83 1.68 1.54 1.41 1.30 1.19 1.09 1.00
6
Calculate the average rate of change in grams per day from day 4 to day 7. Enter your answer as a decimal rounded to the tenths place.

The average rate of change in grams from day 4 to day 7 is approximately 0.11 grams/day

Step-by-step explanation:

The table for the radioactivity in iodine-131 can be presented as follows;

      Radioactivity in iodine-131

Grams                                Day

1.83                                     1

1.68                                     2

1.54                                     3

1.41                                      4

1.30                                     5

1.19                                      6

1.09                                     7

1.00                                     8

The average rate of change in grams from day 4 to day 7 is given as follows;

The average rate of change in grams from day 4 to day 7 = -8/75 ≈ 0.11 g/day

The average rate of change in grams from day 4 to day 7 ≈ 0.11 grams/day rounded to the tenths place.