What is 12×8÷4 divided by three divided by 4÷10×5

When eating out, record the total cost of your meal (before tip) and the tip that you left. determine the percent of the cost of the meal that you left as a tip.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days