x-15,
x represents the unknown number, and to have 15 less you would simply subtract 15 from x....
therefore your answer is x-15
(4n) - 25
12-3/4x
5-w=
32 - n/2
4x - 5
As an algebraic expression it is: 2x-9
Subtract 25 from whatever variable you use for "a number". If your number is "x", then the expression becomes "x - 25".
You write it as5nNothing more, nothing less.
12-3/4x
(4n) - 25
a - 4
4<x
m - 12
M < 90
It is: y-4
x - 10
An algebraic expression for "6 less than 5 and a number" is (5 - x - 6), where x represents the unknown number.