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Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?