What's bigger? (2×8)⁴÷(-5)⁴ or (2×8)⁹÷(-5)⁹​

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Aweekly newspaper charges $72 for each inch in length and one column width. what is the cost of an ad that runs 2 column inches long and 2 columns wide? its not 288