Let's call "a number" x. 500 less than 4 times x would be 4x - 500.
(Take 4 times x, and then subtract 500 to make it 500 less.)
500-4n
500-.4n
(4n) - 25
8<19z
35-(4x)
Expressed as an algebraic expression, this would be equal to 7x - 5.
5-w=
3x - 3
It is: 5k-60
9b2-7
It is simply: x-1
(4n) - 25
8<19z
35-(4x)
4<x
a - 4
It is: 155c-47
8k-5
An algebraic expression for "6 less than 5 and a number" is (5 - x - 6), where x represents the unknown number.