Answer:
Explanation:
Divide the total distance traveled by the total time spent traveling. This will give you your average speed. . So if Ben traveled 50 mph for 3 hours, 60 mph for 2 hours, and 70 mph for 1 hour, his average speed was about 57 mph.
The answer would be reflected.
Answer:
3 half life of the unknown radioactive substance have occurred.
Explanation:
Mass of sample = 320.9 ng
Mass after 1 half life = 0.5 x 320.9 = 160.45 ng
Mass after 2 half life = 0.5 x 160.45 = 80.225 ng
Mass after 3 half life = 0.5 x 80.225 =40.11 ng
So 3 half life of the unknown radioactive substance have occurred.
