The diameter of a circular placement is 42 centimeters what is the approximate area of the circular placement

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

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

Provide all steps given to find the answer. simplify: 5(2x+9)²