300,022,000.
Don't quote me on that, I'm really not all that good at math.
Let x be that number:
x +10 -2 +4 + 3 - 1 - 7 +1 = 0
x +8 = 0
and x = - 8
Answer: 0.0005 milometers
This is an exponential growth problem.
y = 524(1.07)^7
y = 841 bacteria after 7 months