The cost of cell phone plan A is $12 per month plus $0.15 per minute. Cell phone plan B costs $8 per month plus $0.20 per minute. If Amanda talks on the phone for 65 minutes in a month, which plan is less expensive for Amanda, and by how much?

Plan B is less expensive by $0.75.

Step-by-step explanation:

m = months

t = minutes

Plan A

12m + 0.15t

12(1) + 0.15(65)

12 + 9.75

= 21.75

Plan B: 8m + 0.20t

8(1) + 0.20(65)

8 + 13

= 21

21.75 > 21

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

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