Forensics- based on the lines of convergence, at what position was each man at the time of the shootings?

Based on the position vs. time graph which velocity vs. time graph would correspond to the data

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Consider the reaction: n2(g) + o2(g) ? 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?