Simplify 17(sqrt 17) and -9 (sqrt 17)

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

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

Complete the equation of the live through (-1,6) (7,-2)