Write the coefficient of $x^2$ in $-x^2$.

Write the numerical coefficient of

$ab$

Write the numerical coefficient of

$-6bc$

Write the numerical coefficient of

$7xyz$

Write the numerical coefficient of

$-2x^3{y}^{2}z$

Write the constant term of $3x^2+5x+8$.

Write the constant term of $2x^2-9$.

Write the constant term of

$4y^2-5y+\frac{3}{5}$

Write the constant term of

$z^3-2z^2+z-\frac{8}{3}$