Can someone pls tell me how to get the answer?

Write a polynomial for a third-degree polynomial with leading coefficient -4

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

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