What is the classification of the following triangle? Write scalene, Isosceles, or right.
9 cm
1107
7 cm

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

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?