Can someone help me out? I’m studying for my test tomorrow, and I get it for the most part. I’m just confused on a couple of things. I understand how my teacher got all the way to the sinx = -root 2 over 2 but how did they get 5 pi over 4 + 2n pi and 7 pi over 4 + 2n pi?

Determine the quotient and remainder when (6a3)+11a2-4a-9) is divided by (3a-2) express your answer in the form q(a) + r(a)/d(a)

Aplane is taking off from bangladesh headed to new york city. at the same time, a plane from new york city is headed to bangladesh is also taking off. the plane bound to new york city is traveling at 600 mph, while the plane traveling to bangladesh is traveling at 400 mph. how far from new york city will the two planes meet if the distance between new york city and bangladesh is 8,000 miles?

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap