Use inductive reasoning to predict the next line in the sequence of computations. 1 = 1 x 1 1 + 7 = 2 x 4 1 + 7 + 13 = 3 x 7

On the left, we have an increase of 6. On the right, we have an increase of one and the corresponding multiplication:
1 = 1 × n
1 + (1+6) = 2 × n
1 + (1+6) + (1+6+6) = 3 × n

Therefore, the next line should be:
1 + (1+6) + (1+6+6) + (1+6+6+6) = 4 × n
which is:
1 + 7 + 13 + 19 = 4 × 10

Because 1 + 7 + 13 + 19 = 40
And 40 = 4 × 10

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