Answer:
21.2156 here you go............
2nd: you'd make a perpendicular bisector
GG easy
y<19, that means that we include all numbers greater than 19 but not including 19
so go to the graph and go up along the y axis 19 units and draw a horizontal dotted line, then shade below that
looks summat like thar attachment
Your answer is 20. Learn PEMDAS and it'll make this much easier. Parenthesis, Exponents, Multiply, Divide, Add, Subtract.