I need help asap please i'm really stuck on this

The circumference of a circle is 5 pi cm. what is the area of the circle?

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b.you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c.you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d.you spend $5 plus $10 per week until you have less than $45.