Arectangle has a length of x and a width of 5x^3+4-x^2. find the perimeter of the rectangle when the length is 5 feet.

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

X+y=-4 x-y=2 use elimination with adding and subtraction

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