Let $A$ be the number. Translate the following phrase into an algebraic expression.
negative nineteen times a number

Let $A$ be the number. Translate the following phrase into an algebraic expression.

a number divided by $50$.

Let $A$ be the number. Translate the following phrase into an algebraic expression.

the sum of $17$ and a number

Write the following as an algebraic expression.

negative three times the value of $x$ increased by $5$

Write the following as an algebraic expression.

one half of the difference between $y$ and $4$

Write the following as an algebraic expression.

negative four divided by the sum of $a$ and $\frac{5}{2}$