CAN SOMEONE HELP WOTH THISPLS RIGHT ANSWER GETS BRAINLIEST Q4

I'll give brainliest if you answer right : )

What is the fewest number of full weeks briyana would have to work to have enough money? 8 weeks9 weeks 10 weeks11 weeks

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