I am uncertain if that particular statistic is accurate, but the vast majority of collisions ARE caused by driver inattention or error.
99.1
The positive integer factors of 991 are: 1, 991
1 and 991
The total tax is $146.17 and the total price with tax is $1,137.17
991 and 1.991 is a prime number and only has factors of 1 and 991.
0.0091
991 is a prime and so has no proper factors.
991 is already prime. No tree is required.
sqrt(991) = 31.480 (to 5 sf)
No.
76.2308
No. 991 is not evenly divisible by four.