You need to use a variable. When a word problem asks you for "a number" but you don't know what that number is, choose a letter (like x) and say: lets make x be the number I'm looking for.
Now, the word problem asks for the sum of a number (x) and 2.25, which we write like:
x + 2.25
We take this sum, and multiply it by 24 :
(x + 2.25) * 24
What value does this expression have? I dunno, some number. We don't know what that number is, so let us choose another letter, y this time, and say that this expression equals some number represented by y:
y = 24*(x + 2.25)
There, that's an algebraic expression for 24 times the sum of a number and 2.25.
We will assume that the number added to 2.25 is x:
Then the sum of a number (x) and 2.25 is:
x + 2.25
Now we need to determine 24 times the sum (x + 2.25) and we will get :
24(x + 2.25)
Then the algebraic expression for 24 times the sum of a number and 2.25 is :
E = 24( x+ 2.25)
Sum is addition.
A number can be a variable.
And, 24 times should be multiplied outside of the sum.
Therefore, you get 24 (x+2.25)
the expression should be written as : 24(x + 2.25)
since we dont know what the number is we are going to use x to replace it
24 times the sum of a number and 2.25?
24 times the sum of something is: 24 * ( )
The sum of a number and 2.25 is ( x + 2.25)
Combining the statements gives us: 24 * (x + 2.25)
It can be written as a function of x.
f(x) = 24*(x + 2.25)