Asound mixer, impressed by the new equipment that was just installed in his recording studio, says that now he will be able to singers and musicians produce better music because he can eliminate unneeded and undesired wavelengths. what term describes the characteristic of sound waves that the sound mixer is now able to alter?

Frequency

Explanation:

A frequency mixer is an electrical circuit that creates new frequencies from two different signals. The practically new frequency is produced by adding and subtracting input signals.  

The frequency range is shifted from one range to another by a process known as heterodyning. Sound mixers will alter the frequency of waves to suit according to musicians.

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.