Is -9 a real or imaginary number?

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c

Charles is on a 8 1/2 mile bike ride. he stops for a rest after he’s gone 5 2/5 miles. how much farther does he still have to go?

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12