book Maths Puzzle Numerical Ability

How do I find the volume of a sphere with only the circumferance?

7a. Find the volume of an orange whose circumferance is 40 cm. 7a.______________

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book Other Question

How would I solve the inequality for the equation x - 1/x^2 < 0? I came up with the answer of (0,1). Would this be the correct answer or show me how to work for the correct answer. how do add polynomials?what steps do you have to take to find out the answer?