When using the nth term of a sequence to find another term, it's important to make sure that you correctly substitute values in the right place. With sequences, n is equivalent to the term number you are trying to find, in this case 10. Substituting n=10 into the nth term gives you: (2 x n) - 6 (2 x 10) - 6 Multiplying out the brackets gives you: 20 - 6 The final step is just a simle subtr... more