Can someone do this problem and tell me how you did it

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

Percent increase and decrease. original number: 45 new number: 18

Need badly. a newborn lion cub weights 3 pounds. each week its weight increases by 5%. create and graph an exponential function to see the cubs growth. thx a ton!