I feel confused with these algebra questions and it is my first time to study linear progression

The sample results are given as: 0 nM 0.556 0.603 0.509 5 nM 0.524 0.538 0.519 10 nM 0.454 0.469 0.467 20 nM 0.223 0.311 0.358 50 nM 0079 0.074 0.080 Blank 0.055 0.055 0.054 background noise detection Please answer ONLY the following questions and submit a document file online: 1. Based on the given data, plot the data as the optical absorbance of supernatant against the target The concentrations, with the baseline signal level eliminated. The each point you plot should specific the average absorbance (A, no unit) for a particular The concentration (C, unit: nM). Please add an error bar as the standard error for each average point. 2. Please compute the fitting line in the plot (for question 1) as a linear equation, i.e. A = kl*C + k0, where kl and k0 are the constants you need to figure out. 3. What is the 95% confidence interval for k0? And what is the 95% confidence interval for k1