Which of the following is a trinomial?

5 – 2xy is a … expression.

$7x^2-2xy+9y^2-117x^2-2xy+9y^2-11$ is a … expression.

The algebraic expression for “x is multiplied by 7 and 3 is reduced from the product” is …

Write an algebraic expression for “one- fifth of product of x & y” is …

Write a sentence for an algebraic expression “12p-7” is …

Write a mathematical sentence for an algebraic expression is “10 lmn” is …

The Numerical coefficient of $-y^2-y^2$ is…?

The Numerical coefficient of $\frac{-3}{2}x{y}^2{z}^3\backslash frac\{-3\}\{2\}\backslash ,xy^2z^3$ ?

The literal coefficient of $\frac{7}{5}\backslash frac\{7\}\{5\}$ x is …?