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OpenStudy (xxuan):
a balloon has a surface area of 113.1 inches^2. what is the diameter of the balloon? a. 3 b. 6 c. 9 d. 12 e. 15
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OpenStudy (mathmale):
I'd suggest you look up the formula for the surface area of a sphere. This is a function of sphere radius, r. Once you have this formula in front of you, solve it for the variable r. This formula will involve surface area, so just replace A in the formula with the given surface area. The problem asks you for the diameter (not the radius) of the balloon. How will you answer that?
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