With math homework im confused show work

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Beth divided 9 ounces of her granola recipe into 4 equal-sized amounts. she placed the amounts into individual bowls. the fraction 9/4 represents the number of ounces of granola in each bowl. which other number represents the amount of granola beth has in each bowl? (a) 1 1/4 (b) 2 1/4 (c) 1 3/4 (d) 3 3/4 i need !

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.