any help with this? I dont know the formula to start

Complete the tasks correctly on first attempt. Suboptimal > B right\" ess - Ap pl icati o n performance will be rewarded with -2 points per unsuccessful attempt. Dargo Aeryn 0 Q Parallax: 0.0116" 'Distance - .lightyears , ,- Parallax: 0.0063\" App. Mag; 9.882 , . . . . L Distance: SZOlightyears . - . Luminosnty - 5 App. Mag; 11.971 Calcijlate the properties of Dargo. Calculate the luminosities of the other stars. Crichton - O Parallax: 0.069 " Distance: 47lightyears App. Mag; 6.166 Which star is the brightest? (select) > Which star is the most luminous? (select)