I am better at substitution, but you want to get the equations as similar as possible, but are the opposite, so you can cancel it out.
What’s the difference between a radius and a diameter?
2 answers:
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Since we have that the volume of a sphere is given by:
And we have that the diameter equals 3.6ft, we then will have a volume of:
Since we have that the volume is approximately 13.74 ft^3, then the best approximation in the problem is A. 13.6 ft^3.