Subject: mathqa
Question: the two lines y = x and x = - 5 intersect on the coordinate plane . if z represents the area of the figure formed by the intersecting lines and the x - axis , what is the side length of a cube whose surface area is equal to 6 z ?
Option: 
A: 5 / √ 2
B: 16
C: 2 √ 2
D: 8
Answer: A