Which number has the greatest value 9.7 or 9.47

Solve for x where 0 equation: cot^2x+2cotx+1=0

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?

Given: x - 4x > 0, then the solution set in interval notation is: (-2, 0) true o false