Abin contains a total of 20 batteries, of which 6 defective. if you select 2 at random, without replacement, determine the probability that none of the batteries is good and at least one of the batteries is good

The product of two negative rational numbers is always zero sometimes zero never zero

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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