The graph of the polynomial $f\left(x\right)=a{x}^2+bx+c$ is as shown below. Write the signs of $a$ and $b^2-4ac$.

The graph of the polynomials $f\left(x\right)=a{x}^2+bx+c$ is as shown below. Write the sign of $c$.

The graph of the polynomial $f\left(x\right)=a{x}^2+bx+c$ is as shown in the figure below. Write the sign of $c$.

The graph of a polynomial $f\left(x\right)$ is as shown in the figure. Write the number of real zeroes of $f\left(x\right)$.