Given h(x) = 5x + 2, find h(-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

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.