List the sides in order from shortest to longest in triangle abc, with angle a=80 , angle b=3x+5 and angle c=5x-1

Based on what i know about mean, this doesn't add up.

1234567891011 match the reasons with the statements in the proof. given: j | | k m 1 = m 3 prove: l | | m 1. j||k, m∠3 = m∠1 if lines are ||, then corresponding angles are =. 2. m∠1 = m∠2 if alternate interior angles are =, then lines are ||. 3. m∠2 = m∠3 substitution 4. l||m given

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).