How did Operation Twist affect the monetary base?

If the federal government imposes a new tax on golf clubs, that tax

A) encourages people to take up golf. B) encourages people to buy more golf balls. C) encourages fewer people to play golf. D) discourages people from switching from playing tennis to playing golf.

A railroad company lays a line of track between Houston and Dallas. It provides daily service for industrial customers and ships 5,000 ton-miles per day with a single train and only one departure and arrival at each end

It has an opportunity to purchase a second train that would allow it to ship twice the amount of ton-miles per day. Does this firm face increasing, constant or decreasing returns to scale? Explain.