Please help me with this homework

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

In which form is the following function written? y = - 2(x – 3)(x + 5)

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74