Pls help me really need help on 4 and 7

Why does the author attempt to convince the reader that what he has described of the middle colonies is factual?

Which amusement park ride utilizes periodic motion a.slide b.bumper cars c.giant swing d.roller coaster

99 pts which of the following statements refers to the wage-price spiral process? the salary of a worker fluctuates with the amount of sales he or she accomplishes per month. an employee loses his or her job, finds a position at another company, and is underemployed. employees only receive a raise when their purchasing power has been eroded by inflation. a worker receives a raise, which increases costs for the employer.