Question

12, 21, 30 and 39 are the first four terms in a sequence

Write an expression for the nth term of this sequence

Answer 1

12, 21, 30, 39, 48, 57, 66, 75, 84.

Ninth term is 84.

Explanation:

The rule for this sequence is "add 9".

So, using this rule, we can do......

12, 21, 30, 39, 48, 57, 66, 75, 84.

Remember to add 9 each time!

Best of luck :3