7 times a number is equal to 12 more than three times the number. Find the number.
1 answer:
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Considering the surface area of the spherical ballon, it will take 7 seconds for the the balloon to fully inflate.
<h3>What is the surface area of a sphere?</h3>The surface area of a sphere of radius r is given by:
In this problem, the surface area is of cm², hence the radius in cm is found as follows:
r = 14 cm.
The radius start at 0 cm, inflating at a rate of 2 cm/s, hence it will take 7 seconds for the the balloon to fully inflate, as 14 cm/(2 cm/s) = 7 s.
More can be learned about the surface area of a sphere at brainly.com/question/21207980
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