Marcus earns money from feeding cats and answering emails. he earns $7 a week for each cat he feeds and $0.20 for each email he answers. marcus answered 140 emails and earned $49 last week. part a: create an equation that will determine the number of cats he fed. (already answered, my answer was "7c / 21") (/ = division symbol, correct me if question is wrong) part b: solve this equation justifying each step with an algebraic property of equality. part c: how many cats did marcus feed last week? < -- a total of 3 (correct if wrong) need with part b, correct my answers though for part a & c if wrong.