HELP ME PLEASE, I NEED HELP AS SOON AS POSSIBLE T^T i have no clue what im doing

Find the area of a regular nonagon (nine sided polygon), that has an apothem of 16.48 and a side length of 12.

Given the sequence 7, 14, 28, 56, which expression shown would give the tenth term? a. 7^10 b. 7·2^10 c. 7·2^9

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota