In any triangle abc, prove that
(c-bcosA) / (b-ccosA) =cosB/cosC

Which shows the correct lengths of side c in both scales? scale 1: 45 m; scale 2: 60 m scale 1: 60 m; scale 2: 45 m scale 1: 36 m; scale 2: 27 m scale 1: 27 m; scale 2: 36 m mark this and return save and exit

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Find two consexutive odd integers such that the sum of their square is 650