Answer:
3.1%
Step-by-step explanation:
6/196 × 100% = 3.1%
Since the toss can either be heads or tails and only one of these can land at a time the answer is 13
The given plane, 
, has normal vector 
. Any plane parallel to this one has the same normal vector.
Let 
be any point in the plane we want. The plane contains the point (1, 1, -1), so an arbitrary vector in this plane is
and this is perpendicular to 
.
So the equation of the plane is
or equivalently,
To estimate you would round the numbers, so it would be 7,000 - 4,000 = 3,000.
