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Restrictions on f(x) = 1/x+5 and g(x) = x-2

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Which point-slope form equation represents a line that passes through (3,-2) with a slope of -4/5