The cone and cylinder below have equal surface area

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?

Bring the fraction a/a-4 to a denominator of 16-a^2

Me i'm timed right now! there's 4 answer