What does a technical job demand, and in what way does it the individual doing that job?

A highly technical job demands special SKILLS, which helps the person get higher WAGES.

Higher education in America (back in the colonial era) began with religious colleges aimed mainly at training ministers.  From that beginning, colleges typically developed with a liberal arts curriculum.  The 19th century, from 1850 onward, saw the opening of many such colleges in the USA.  But beginning in the early 20th century, there began to be also an emphasis on vocational and technical education.  Schools were started to give training in skills needed for industries and trades.  Today there are many 2-year community colleges and other private "vo-tech" (vocational/technical) schools that provide training needed for specialized technical jobs.  Online programs are available also.

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^