Posted by **boobies** on Sunday, January 13, 2013 at 9:10pm.

Mary is blowing up a birthday balloon.After the first breath, the balloon has a 5 cm diameter . the diameter increases at a constant rate of 20% each second. What is the diameter of the balloon after 3 seconds?

- Math -
**micro**, Sunday, January 13, 2013 at 9:34pm
is the answer 8 cm?

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**Reiny**, Sunday, January 13, 2013 at 9:46pm
after 1st breath , diameter = 5cm

after 2nd breath , diamieter = 1.2(5) =

after 3rd breath, diameter = 5(1.2)^2=

(this question is physically unrealistic, Mary would be inserting the same amount of volume, which would show up with smaller and smaller increases in the diameter, certainly not a steady 20% increase each second)

- Math -
**hadeel**, Tuesday, December 3, 2013 at 1:19am
after 1st breath , diameter = 5cm

after 2nd breath , diamieter = 1.2(5) =

after 3rd breath, diameter = 5(1.2)^2=

- Math -
**Karan**, Saturday, February 15, 2014 at 7:58pm
The diameter of the balloon after 3 s is 8.64cm.

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