Question

Zina spends 1.5 hours setting up her sewing machine and making one hat. The total amount of time spent making hats can be represented by the sequence below.

1.5, 2.25, 3.0, 3.75, ...
Which recursive formula can be used to determine the total amount of time spent making hats based on the total amount of time spent previously?

Answer 1

Let a_1 be the first term

Let d be the common difference

The recursive formula can then be given by

a_1 = first term
a_n = a_(n-1) + d

Plug in the values for first term and common difference