Confirm that the following properties of the greatest common divisor hold: (a) if ged(a, b) = 1 and cla, then ged(b, c) = 1. (b) if ged(a, b) = 1, then god(ac, b) = ged(c, b). (c) if ged(a, b) = 1 and c(a+b), then god(a, c) = ged(b, c) = 1.

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?

How do i take any fraction and make it into a decimal or percentage?