Answer:
D. 35x + 78 ≤ 225
Explanation:
Let the parameter (x) represent the number of hours worked. As per the given situation, no more than ($225) will be spent, therefore the expression will be less than or equal to ($225), thus option (A) can be ruled out.
Additionally, the cost is (35) per hour, meaning that this will be the coefficient of variable (x). Therefore, options (B) and (C) can be eliminaoed.
Since there is a flat charge of ($78), the (78) must be added to the term (35x), hence the only option that satisfies this is option (D).