need help with both parts 4a & 4b

4a. ( 3 points) Use the calibration curve on the right to calculate the % salt by mass of a solution that has a density of 1.173g/mL. 4b. (3 points) Compare the calibratiof curve in question \#4a to the calibration curve shown here. Which calibration curve has the higher quality data? Briefly explain your reasoning. 4b has the higher X as it is closer to the density of the solvion