Question 123336
I need to find the value of {{{x}}} at the axis of symmetry. 
whatever {{{y}}} is will be the maximum, but I only need {{{x}}}
to answer the problem
{{{y = -.0012x^2 + .074x + 2.69}}}
When the equation is in the form {{{y = ax + bx + c}}}, the {{{x}}} value at
axis of symmetry is {{{x = (-b) / (2a)}}}
{{{a = -.0012}}}
{{{b = .074}}}
{{{(-b) / (2a) = -.074 / 2*(-.0012)}}}
{{{(-b) / (2a) = 30.833}}}
The year in which the stabilization ratio is maximum is
{{{1950 + 30.833}}} or late in the year 1980. answer