Write the domain as an inequality

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

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

Which is a graph of a proportional relationship?