Does the function have a constant rate of change? if so, what is it?

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Ahovercraft takes off from a platform. its height (in meters), xx seconds after takeoff, is modeled by: h(x)=-2x^2+20x+48h(x)=−2x 2 +20x+48 what is the maximum height that the hovercraft will reach?