The students in Mrs. Martinez’s class begin with 30 minutes of Free Time Friday on Monday morning. However they can lose and gain minutes back for Free Time Friday throughout the week. On Monday, they did not lose any minutes, on Tuesday they lost 8, on Wednesday they lost another 2, on Thursday they gained back 6, and by Friday they lost 5 more. How many minutes did they have on Friday? I need an algebraic equation for this. Please help!!!

Nina has prepared the following two-column proof below. she is given that ∠oln ≅ ∠lno and she is trying to prove that ol ≅ on. triangle oln, where angle oln is congruent to angle lno step statement reason 1 ∠oln ≅ ∠lno given 2 draw oe as a perpendicular bisector to ln by construction 3 ∠leo ≅ ∠neo transitive property of equality 4 m∠leo = 90° definition of a perpendicular bisector 5 m∠neo = 90° definition of a perpendicular bisector 6 le ≅ en definition of a perpendicular bisector 7 δole ≅ δone side-angle-side (sas) postulate 8 ol ≅ on cpctc nina made two errors in the proof. identify and correct the errors.