Lucy and her friends are selling boxes of cookies. The equation shows the amount of money, y , collected for x boxes of cookies sold. 18x = y

Answer! if you don’t mind, can you explain

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

The area of a circle is equal to 1 dm². find the radius of the circle.