In conducting survey research, the ability to solve a certain kind of problem is found to increase as the subjects of the study vary in age from 8 years old to 12 years old. Taking a mathematical measure of this relationship will be the extent to which age to problem-solving ability

Taking a mathematical measure of this relationship will be the extent to which age positively correlates to problem-solving ability.

Explanation:

As seen in the question above, a survey has concluded that there is a tendency for young people to be more able to solve problems with increasing age. Issio shows that the ability to solve problems and age are directly related. We can say that this relationship is positive because problem solving increases as age increases.

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.