What does the triangle sum theorem tell us?

What could explain what happened when the time was equal to 120 minutes

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

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?