Hello.
Henry earns $6 each time he waters Mr.Young's lawn. If he were to mow the lawn 4 times in July and 4 times in August, he has mowed the lawn 8 times in total. We can find our answer by multiplying how much he earns by how many total times he has mowed the lawns.
6 * 8 = 48
Henry will earn (in total) $48 if he waters the lawn 4 times in July and 4 times in August. Some helpful advice for future reference: Ignore some of the context that won't help or is trying to distract you from finding the answer. In this case, that'd be "August" and "July" as these months are trivial to the problem in the first place. All you needed to know was that he mowed the lawn 8 times, and earns $6 for each time he mows it.
I hope this helps!