It didn't let me put the whole picture, so here are the words/word it cut out. Parallel (first word at the top before lines)

Prove (before <1)

Parallel lines m and n are cut by the transversal line t.

Prove <1 and <4 are supplementary. Move options to the boxes to complete the proof.

The options to complete the proof are placed in the boxes of the attached drawing created with Microsoft Word

Step-by-step explanation:

Please see attached drawing of the proof created with Microsoft Word

The two column proof can be  presented as follows;

Statement                                        Reason

                                                 Given

m∠3 + m∠4 = 180°                           Linear pair postulate

∠1 ≅ ∠3                                            Corresponding Angle Theorem

m∠1 + m∠4 = 180°                            Transitive Property      

m∠1 and m∠4 are supplementary   Definition of supplementary angles

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: