can someone please help me with these questions? I’m not sure how or when to use Sin, Cos nor Tan. I’m confused which numbers to use... thanks!

Evaluate the integral. (sec2(t) i t(t2 1)8 j t7 ln(t) k) dt

In the final round of trivia competition, contestants were asked to name as many states that begin with the letter m as they could in 15 seconds. the bar graph shows the number of states the contestants were able to name. how many contestants participated in the final round of the competition?

Find the total area for the regular pyramid ( follow the answer set up in the picture)