"What are the possible values for x that result in 800 square feet of space for the dogs? Show all your work." 800=x(60-x)

i think the answer is 40 and 20 but i want to see someone else's work. thank youu

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

Can someone, me with this.i really need with this

Algebraically prove that a clockwise and counterclockwise rotation of 180° about the origin for triangle abc are equivalent rotations.