Sloanes family collects the same number of postcards every year and she inherits the collection. 6 years after she inherited it, there were 425 postcards in the collection. After 10 years there were 445 postcards.

a) This solution is a(n) type of word problem.

b) Write the equation that represents y, total number of postcards, in terms of x, the number of years after they were inherited.

c) How many total postcards will there be in the collection after 22 years?

d) How many years will it take to have 605 postcards?