Write (12x - 7yi)(2 + 4i) + (-12x - 7yi)(2 + 4i) in a + bi form, where y is a real number.

Need on this geometry question. explain how you did it.

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.

Awavelength of 610 nm was found to be the most intense wavelength emitted by copper. answer the following questions about this wavelength of light. a) what is this wavelength in cm? b) what is the frequency that corresponds to this wavelength? c) what is the energy of light of this wavelength? d) what is the wavenumber corresponding to this wavelength?