Answer:  5 + 3x ≤ 20;  5
Step-by-step explanation:
at most means not more than(less or equal to),which use the symbol ≤. Let x be the hour that Max rent.
5 + 3x ≤ 20
   3x ≤ 15  [Subtract 5 from both sides.]
    x ≤ 5   [Divide 3 from both sides.]
Any value less than or equal to 5 will be satisfies the inequality.