Answer for a) is 15/2 gotten by multiplying 7•2 and adding 1.
b) is 11/3 gotten by multiplying 3•3 and adding 2.
c) is 27 and 1/2 gotten by changing the mixed numbers into the fractions above and multiplying then changing back into a fraction by dividing 165/6.
d) is 2 and 1/22 which is gotten by again changing the mixed numbers into fractions dividing by flipping 11/3 into 3/11 and multiplying which gives 45/22 which when divided gives you 2 and 1/22.