True.
Any and all lines that are parallel share the same slope.
The median is the middle term in a group of data when arranged from least to most. Let's arrange the numbers from lowest to highest.
19, 20, 24, 28, 31, 37, 39, 43, 47
The middle term is 31. Thus, the media of this data is 31.
Calibration curves <span>absorbance versus concentration may deviate from a straight line when A<0.1 and when A>1 maybe because at these values the substances react to light differently which will cause it to not follow a linear graph. Hope this helps. Have a nice day.</span>