One rule of thumb for estimating the size of a crowd is that each person occupies1.8 square feet. Use this rule to estimate the size of a crowd watching a parade along a 3 mile section that is standing 12 feet on both sides of the street. (hint: 1 mile = 5,280 feet)

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The bystander effect  for some reason my history teacher was talking about this 

Some connecting rods have to lubricate the cylinder wall or piston pin. the answer is letter d. graphite coating can be a major  additive to many  coating  systems and things such as connecting rods.  it functions as a refractory, lubricant, thermal conductor, and electrical conductor for a machine or thing to enhance its work.