The correct answer is the first option.
If you want to use elimination, you can sum the two equations for example, so that the x's simplify:



Plug this value for y in one of the equations to derive the value of x:

So, the solution is 
P+2-4=14
p-2=14
add 2
p+2-2=14+2
p+0=16
p=16
Robert is not correct because in order for it to be supplementary the angles have to be consecutive interior
56% can be represented with 56/100. That fraction can be reduced (or simplified) to 14/25.
Step-by-step explanation:
Radius (r) = 2 ft
V = 4/3 × 22/7 × (2)³
= 4/3 × 22/7 × 8
= 33.52 ft³