Answer:
The answer is a(n)=12+(n-1)11; 166 millimeter
Check photo for answer! i have included work
10 divided by 2 =5 because it ends at 10 and goes back by 2 and there are 5 loops
5.9 × 10^24 = 5,900,000,000,000,000,000,000,000 minus
13,000,000,000,000,000,000,000 equals
5,887,000,000,000,000,000,000,000 kg
which is the amount greater that Earth's mass is. you could write this problem as
5.9 × 10^24 - 13 × 10^21 = 5.887 × 10^21
That's 6 hours and 6/24 is 1/4 so 1/4 is the answer