So that you can keep notes just in case you need them later on.
Answer:
7.7 x x/100 = 16
x100 x100
7.7x = 1,600
Divide by 7.7 on both sides:
X = 207.79 around 208
78 qt = y = max+b to the equation.
Answer:
Maximum area = 9 sq units
Step-by-step explanation:

which represents the area . As it is a quadratic equation it represents the parabola . And the vertex of the parabola will maximum area of for some value of x
let f(x) = y


Comparing it with the standard equation of parabola

we get h=3 and y=9
where (h,k) is the vertex (3,9)
Hence the maximum area of the rectangle will be 9