because it is a rectangle, the area is expressed as a = xy, or length times width.
because it is next to the river, he only needs to fence three sides, so f = x + 2y.
knowing the amount of fencing available is 7500m, we get:
7500 = x + 2y solve for x
x = 7500 - 2y substitute into the area equation
a = (7500 - 2y)y distribute
a = -2y2 +7500y
you can see that this is a parabola which opens down, meaning that the point of maximum area will be at the vertex, y = -b/2a = -7500/[2(-2)] = 1875
x = 7500 - 2(1875) = 3750
a = 3750(1875) = 7,031,250 m2
if 5 cakes equal 3.50. we must divide 3.50 by 5 to see the price of just one cake. now since 3.50/5 is 0.70. we must multiply 0.70 by 7. since we have 7 cakes. now we get our simple answer of $4.90.
if this mark brainliest, and hit button too.
and wants to enclose a rectangular plot