Determine two complex numbers, (a+bi) and (c+di), where a and d are irrational numbers and b and c are rational number

Of the groups of elements below, which are most likely to gain electrons to become anions? a. alkali metal b. boron group c. halogen d. transition metal

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.