Question 637087
The maximum y is in the vertex of parabola {{{y=-x^2+7x+3}}}
x-coordinate of the vertex {{{x=-7/(2*(-1))=3.5}}}
y-coordinate of the vertex {{{y=f(3.5)=-(3.5)^2+7*3.5+3=15.25}}}
Answer: 15.25