Find the measure of side LM

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?