Is {(1, −9), (−8, 6), (−8, −5), (−7, −2)} a function or not?
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What is the simplified expression for 6(2(y+x))

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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