The predicted time remaining has decreased by 30 years, so the second one would be the answer
9...
75 + 6 = 81
The square root of 81 = 9
The answer is (-7r-6s)/3s
8 x 64
=64 x 2 x 4
=128 x 2 x 2
=256 x 2
=512
The first prime numbers are 1 and 3 ,5,7,9 Added together the total is 25