Is there a maths genius on the forum?

I'm having a nightmare with some math problems, if anyone is able to help I would very much appreciate it.

I've been tasked with plotting a graph with results of an experiment I conducted and then create a polynomial regression line. No problem.

I've created a graph and got my polynomial equation. The graph is as follows:
  • X axis = concentration
  • Y axis = absorbance
Might be easier to plot:
  • Y axis = concentration
  • X axis = absorbance, then get that equation and just plug in the numbers to get Y.
 
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