A: If Evan earns m in x number of weeks, then the equation would be m=12x
B: The wording here is a bit strange, but I can probably work it out.
Here, you want to include overtime pay in the equation. If 30 hours is included, that would make the equation 12 × 30 + 15y = T
C:
Start with the equation:
12 × 30 + 15y = 510
360 + 15y = 510
15y = 150
Now you need to get the variable on its own, so you divide both sides by 15.
y = 10
If you have any questions about the process, please tell me!