Last week at an insurance company, Yibin sold an average of 5 automobile and 7 homeowner policies per day over a 5-day period, Priya sold an average of 10 automobile and 9 homeowner policies per day over a 5-day period, and Dakota sold an average of 8 automobile and 6 homeowner policies per day over a 4-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.) b) Find the total number of automobile policies and the total number of homeowner policies that were sold by Yibin, Priya, and Dakota. A total of automobile policies and a total of homeowner policies were sold. (Type integers or decimals.)