889,531 rounded to the nearest 10 thousand

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

Scott’s bank account showed a balance of $750 on sunday. during the next five days, he made one deposit of $140 and numerous withdrawals of $180 each. let x represent the number of withdrawals that scott made. write an inequality that can be used to find the maximum number of withdrawals that scott could have made and maintain a balance of at least $100. do not use a dollar sign ($) in your response.

Meee i honestly dont know what this question talking about