Lisinchaeviz Lisinchaeviz Math Answered The length of a rectangle is m + 2n dm. and its width is 3m - nam. Find its area A.)3m2 + 7mn - 2n? B.) 3 m² + 6mn-2n² - C.) 3 m2 + 5 mn - 2n² D.) 3 m² - 5mn - 2n2