The constant term in $3\mathrm{A}+7\mathrm{B}+\frac{5}{13}$ is 

The literal coefficient in $-5xyz$ is _____ .

$2x +3y$ is a _____ . (monomial, binomial, trinomial)

The algebraic expression for $7$ less than twice the number $x$ is _____.

A rectangular field of length $a$ units and breadth $b$ units has a perimeter expressed as $K\left(a+b\right)$ units, then the value of $K$ is _____.

Write the following algebraic expression using signs and symbols.

$19$ taken away from the sum of $\mathrm{x}$ and $\mathrm{y}$.