It looks like the first 3 are because they all are blank x2.5 but the last one would be 8x2.5=20..
Coplanar means that points lie in the same plane. Since A, E, and D all lie on the back wall, they are coplanar.
There are (8) eighths in 1, so multiply this by 6 1/2 to determine how many eighths there are:
8*6.5 = <u><em>52 eighths</em></u> in 6 1/2
Use this equation: Amount after years=Initial investment*(1+Interest rate/time compounded yearly)^number of years*times compounded yearly
So A=25,000(1+.095/1)^8*1
Simplify
A=25000(1.095)^8
Simplify
A=25000(2.07)
Solve
A=$51,671.73
This equation can be used for all problems of this type.