need help with plotting the migration distance as well as Calculating thr Rf for substance A showing work

the answer for the migration distance of substance B

2. need help with a explanation

QUESTIONS AND PROBLEMS: 1) The bor below represents another chromatogram. The solid line is the origin; the dotted line is the solvent front. "Substance A and "Substance B are represented by spots (crosses showing the: center of the spot) on the orisin line. a) Calculate the Ri for "Substance A " which reaches point (center of the spot for "Substance AN ) in this solvent. show work. b) "Substance B" " has an Re of 0.450 in this experiment. Solve the equation Rf=MigrationdistanceofsolventfrontMigrationdistanceofsubstance(tothecenterofthespot) for the migration distance of "Substance B in the space below and plot the migration distance for "Substance B" (show the center of the spot for "Substance B "). Aigration distance of Substance B= 2) A quality control technician performed a melting point experiment on the aspirin made by some pharmaceutical company. He noted that the aspirin began to melt at 125C and was completely melted at 133C. He repeated the experiment two more times taking great care to watch the solid. The results were the same. The meiting point of aspirin is given as 135C. Based on these results, did the quality technician allow the company to sell the oroduct