Answer:
Part 1) The expression is

Part 2) The value is

Explanation:
Part 1) Find the expression
Let
n -----> the number
we know that
The algebraic expression of the phrase "The product of 24 and a number" is equal to multiply the number by 24
so

Part 2) Find the value of the product when n=4.8
substitute the value of n in the algebraic expression
