If the sum of the measures of the interior angles of a polygon is 1980 degrees, how many sides does it have? I need an explanation to this!

In what form is the following linear equation written y=9x+2

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?