7. For each scenario below, write a function (include output units) that would model the amount of consumer credit in the United States, it years after 2000: a. Consumer credit in the United States was 1719 billion dollars in 2000 and was increasing by 107 billion dollars each year. b. Consumer credit in the United States was 1719 billion dollars in 2000 and was increasing by 6.2% each year. c. According to the model in part a), when would consumer credit reach $3 500 billion? years after 2000, in the year d. According to the model in part b), when would consumer credit reach $3500 billion? years after 2000, in the year