What's the exponential notation for 729?

Regular price is $77.00 and the discount is 5% find the sale price

Sandy is ordering bread rolls for her party,she wants 3/5 of the rolls to be whole wheat. what other factions can represent part of the rolls that will be whole wheat? shade the models to show your work.

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b