Trying to find out what 18 minus one third is and what 12 minus 0ne fourth

Find two rational expressions that have the difference of 2-n/n-4

What is the equation of a line passing through (-6,5) and having a slope of 1/3

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