math

PLEASE HELP ME ANSWER THIS QUESTION. THIS QUESTION IS HARD FOR ME AND i DON'T GET IT. please show working when answering. Just in case your wondering this is a practice question. Use the following pattern to answer the question

Design (n) Number of toothpicks(n)


1 5
2 9
3 13
4 17
5 21
6 25

Give the rule for the total number of toothpicks that Sarah would need if she was to continue following the pattern and complete ‘n’ designs.

Use this rule to find the total number of toothpicks needed to complete the first 12 designs using Sarah’s pattern.

Hints: I already know the equation for the nth design is 4n+1=t. But, the question is asking for the total equation.

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