"The sum of two irrational numbers<span> is SOMETIMES </span>irrational<span>." The </span>sum of two irrational numbers<span>, in some cases, will be </span>irrational. However, if their rational<span> parts of the </span>numbers<span> have a zero </span>sum<span>(cancel each other out), the </span>sum<span> will be rational.</span>
The rate of change of the radius dr/dt = . 75 in/min because the radius is increasing with respect to time. hence, the volume is increasing at a rate of 75π cu in/min when the radius has a length of 5 inches.