what correlation coefficent to use.

I have right clicked on the trendline and format trendline and show the R-squared equation.

I have also used the 2 columns (costs and profit) and used a RSQ formulae

I have also used the Pearson's r formulae.

The question I have is what does each of them show for my data???? and which is more relevant to show as the cost increases the profit also increases or doesnt????? I wanted to use all three but not sure???

Please please help as your previous advice was perfect.