30 students participate in one or more of three sports: baseball, tennis, and golf. 4 students participate in all three sports, 9 play both baseball and golf, 6 play both tennis and golf, and 7 play both baseball and tennis. if 16 students play tennis and 12 play golf, what is the total number of students who play only baseball (and not tennis or golf)?

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box

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?