Jenny has 280 meters of fencing and wishes to form three sides of a rectangular field. the fourth side borders a river and will not need fencing. as shown below, one of the sides has length x (in meters). find a function that gives the area a(x) of the field in terms of x

a(x) = x*y = x*(280 - 2x) square meters

Step-by-step explanation:

In the figure attached, a plot of the problem is shown. Let's call y the length of the side that parallels the river

The perimeter that the fence cover is:

2x + y =  280 meters

Isolating y:

y =  280 meters - 2x

The area of the field is:

a(x) = x*y = x*(280 - 2x) square meters

x/7.50 = 15

x= 7.50 / 15 divide

step-by-step explanation:

the answer is 0.3175 hope that you ^w^

also you might actually want to put this picture up if you want people to solve it luckily i remember this question