Liza likes to play slot machines when she takes trips to las vegas. she never knows which quarter will cause a slot machine to "hit," but she also knows that the more times she plays, the more likely she is to hit a jackpot. based on what is known about schedules of reinforcement, you should conclude that liza's gambling is being reinforced based on a:

A variable-ratio schedule refers to a schedule of reinforcement where a reaction is strengthened after an unusual number of reactions. This timetable makes an unfaltering, high rate of reacting. Betting, gambling and lottery amusements are great cases of a reward in light of a variable ratio schedule.

the correct answer is modern american cars are not available due to trade restrictions.

trade between cuba and the united states have serious restrictions. the u.s. imposed an economic embargo on cuba, that among other things means that modern american cars are not available due to trade restrictions.

in response to some governmental actions of the authorities from cuba, president john f. kennedy proclaimed an embargo on trade between both countries in february 1962. the trade embargo remains active until this day and was implemented directly by the departments of commerce and the department of treasury.

in president trump’s administration, there is a national security presidential memorandum that "strengthens the policy of the u. s.", affecting trade with cuba.