Given that a = 3i + 4j, b = 2i − 3j and c = −i + 5j, find the following vectors:

a. a + b + c 

b. a + b − c 

c. a − b + c

d. 2a + b + 3c 

e. a − 2b + 3c 

f. 2(a + b) − 3(b − c)

g. 2(2a + b − c) – 3(a − 2b + c)