Apply the distributive property to: 3(u+6)

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

Can someone me do math because i am having a breakdown rn because i don’t get it

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that