please could someone explain with answers. seem to be confused in where to start. thank you!

EDTA forms coloured complexes with a variety of metal ions that may serve as the basis for a quantitative spectrophotometric method of analysis. The molar absorptivities of the EDTA complexes of Cu2+,Co2+, and Ni2+ at three wavelengths are summarized in the following table (all values of are in M1cm1 ). Using this information determine the following: (a) The concentration of Cu2+ in a solution that has an absorbance of 0.338 at a wavelength of 732.0nm. Give the empirical equation fnn are using for the calculation. (b) The concentrations of Cu2+ and Co2+ in a solution that has an absorbance of 0.453 at a wavelength of 732.0nm and 0.107 at a wavelength of 462.9nm. (c) The concentrations of Cu2+,Co2+, and Ni2+ in a sample that has an absorbance of 0.423 at a wavelength of 732.0nm,0.184 at a wavelength of 462.9nm, and 0.291 at a wavelength of 378.7nm. [12]