Can someone me complete this two-column proof?

an explanation on how to do it would be nice.. (picture below)

(and don't answer if you don't know, .)

given: < 2 and < 5 are supplementary.
prove: l || m

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

Which translation maps the vertex of the graph of the function f(x) = x2 onto the vertex of the function g(x) = x2 – 10x +2?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.