Last week at an insurance company, Zach sold an average of 9 automobile and 7 homeowner policies per day over a 5-day period, Elena sold an average of 6 automobile and 5 homeowner policies per day over a 4-day period, and Dakota sold an average of 8 automobile and 10 homeowner policies per day over a 5-day period. Complete parts a and b below. a) Express this information as a sum of scalar multiples of three 2 x 1 matrices. (Type an integer or decimal for each matrix element. Do not simplify.)