Final answer:
The algebraic expression for '7 less than m added to n' is 'm + n - 7', which corresponds to option B 'M+n-7'.
Step-by-step explanation:
The algebraic expression for "7 less than m added to n" can be translated step by step. First, you interpret 'm added to n' which gives us 'm + n'. Then, '7 less than something' signifies that you need to subtract 7 from that 'something'. In this context, the 'something' is the sum we just formed ('m + n'). Therefore, the correct expression is 'm + n - 7'.
To simplify further, you would combine like terms wherever possible, but in this expression, there are no like terms to combine as 'm' and 'n' represent different variables. It is always important to check the answer to see if it makes logical sense within the context of the problem. In this case, option B 'M+n-7' is the accurate representation of the English phrase given in algebraic form.