The nth term of a sequence is fine by the expression 5-3n write down the first two terms of this sequence

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl

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?