If the first quartile class= (40-50) and i/ f (N/4 -cf) =8 then find quartile.

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

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?

Arectangular yard has area 96 square feet. if the width of the yard is 4 feet less than the length