What is the unavoidable variation in something being measured?

What is the "great pacific garbage patch"? (a) a large area of marine debris concentrated by rotating ocean currents (b) a large area around the pacific rim where debris collects from natural disasters such as tsunamis (c) an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability (d) a large trash dump located in hawaii

Find the equation of the line passing through the point (–1, 5) and perpendicular to the line 3x + y = 4.

Based on the information in the graph, what can you conclude about humans in the world in general?