Please help! *Giving brainiest* due really soon

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

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

Each day jake donates money to the global.