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)?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point

What is fraction that is equivalent to 3/8