Divide and simplify. Must show all steps to simplifying 1/(x+2)÷(x^2-4x-12)/(2x-1)

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

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

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?