A(n) is of the form f(x) = a, where a is any number.

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

Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.

Tan198=asin164=? how to solve this? ?