Solve the inequality \sqrt(9-x)>-2

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Find the zeros of each function. f(x) = x^2 + 5x - 6

Which equation shows the quadratic formula used correctly to solve 5x2 + 3x -4 0 for x? cos -3+ v (3) 2-4() 2(5) 3+ |(3)² +4() 205) 3+ (3) 2-4() -3+ v (3)² +4()