Write the first four terms of each sequence.

(1) f (1) = 7, f (n) = f (n-1) + 15

(2) f (1) = 2, f (n) = f (n-1) - 7

(3) f (1) = 30, f (n) = 2•f (n-1) - 50

Find the sum of the summation of 3 i minus 15, from i equals 2 to 7.

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