The nth term is 7n-4 and so the next number in the sequence is 31
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7n - 4
Subtract 7 from each number, so the 9th number would be 59.
10 and 17
The differnace between the numbr is 7, therefore the first part of the formula will be 7n, now for the first term we replace n with one so nx7=7 and to get to 10 you need to add 3 making the nth term 7n+3, To check your answer you must replace n with the two (for the second term) which comes to 14 to get to seventeen you need to add three so the formula nth term 7n+3, hope this helped
y = 7x - 4