The radius $r$ of a sphere of volume $V$ is given by $r= (3V/4π)^{1/3}$
A student calculates the following:
$$[r(1)-r(0.5)]/0.5$$
$$[r(1.5)-r(1)]/0.5$$
$$[r(2)-r(1.5)]/0.5$$
What can be said about the pattern of the results?
Should I change the first formula so that it becomes $V=(4/3)πr^3$ first?