2. Determinați numărul x din:

a) 3x + 36 =72 ; b) 5x – 175 = 120; c) 65 × 13x = 4 225;

d) 5x : 36 = 8200; e) 23× x = 2 323; f) 4 225 : (13x) = 65.

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte