translate to an algebraic expression

49 less than b

b - 49

b-49

The algebraic expression for "49 less than b" can be written as:

b - 49

To translate the phrase "49 less than b" into an algebraic expression, you need to use subtraction. The word "less" indicates that we need to subtract 49 from b.

So the algebraic expression would be:
b - 49