Let f(y)=35(y - 3)Determine the value(s) of y, if any, for which f has a horizontal tangent line. If mulitple such values of yexist, use

Let f(y)=35(y - 3)²Determine the value(s) of y, if any, for which f has a horizontal tangent line. If mulitple such values of yexist, use a comma-separated list to enter the solutions.of has a horizontal tangent line at y =Of has no horizontal tangent lines.