I only need help with b-5 solve asap please

Is a positive integer raised to a negative power always positive

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

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