X-3=14
+3 +3
x=17
x-3=-14
+3 +3
x=-11
It looks a little less than 1/2 or 4/8, so probably 3/8 of the gas is left.
It is already in standard form.
Step-by-step explanation:
Day 1: 1200g / 2¹ = 600g
Day 2: 1200g / 2² = 300g
Day 3: 1200g / 2³ = 150g
The pattern is the amount of radioactive substance on day n is 1200 / (2^n).
Therefore, we have to find n where 2^n > 1200.
The first such n is 11 (2¹¹ = 2048).
Hence, there will be less than 1 gram on day 11.
