The time, t(in minutes), you need to type a certain paper varies inversely with the rate, r (word per minute), that you can type. When typing 40 words per minute, you can finish in 50 minutes. Find the constant of proportionality and write and equation relating t and r.

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