Agiraffe's hunger level depends on the size of its last meal what is the independent variable

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.