PLEASE HELP WILL GIVE BRAINLIEST TO THE CORRSCT ANSWER (3 x 10 to the power of 9) x (2 x 10 to the power of 17) = ? x 10 to the power of ?

Me because some of question i don’t understand

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