Write a 4 digit number that has no zeroes and is divisible by 5 and 9

With #! i’ve tried to figure it out but i can’t.

Which of the following is true for the relation f(x)=2x^2+1

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0