An aqueous solution containing the [Cu(NH3)4]2 complex ion was analyzed at 580 nm using a SpectroVis spectrophotometer and a cuvette with a 1.0 cm path length. The absorbance of the solution was 0.301. If the equation of the line for the calibration plot of [Cu(NH3)4]2 at 580 nm is y = 56.0x + 0.0081.
What is the concentration of [Cu(NH3)4]2+ in the solution?

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .