3x−5y+4z=5
5x+2y+z=0
2x+3y−2z=3

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?

Quickly multiply and simplify polynomials (x – 4) (x^2 – 5x – 6)

Describe a situation where it would be beneficial to round decimals to the nearest dollar. explain why you would use rounding in that situation.