Question

The function y=-0.0003xsquared + 0.03x + 1.3 shows the population of Philadelphia County between the years 1900 and 1990, where x is the number of years after 1900 and y is the population for that year in millions of people. Find the vertex of the parabola that represents the function. What does it represent in terms of the scenario?

Answer 1

???????????? vertex ???????????

y=-0.0003 x^2 +0.03x +1.3

me thank yu want point weer slope=0, wich is the hi point

yu hav negatix x^2, so parabols tern DOWN

dy/dx=-0.0006x +0.03

tu find horizontal tangent, set slope=0, so

 x=-0.03 / 0.0006...=-3/0.06...=-300/6=-50

=50 yeers B4 the time span yu talk bout

me spekt the quashun NOT true for that yeer