For question 4, if you change

"A pet adoption center with at least ten years of continuous operations will be supported by the Mittens Foundation if it shelters more than fifty animals."

to

"A pet adoption center with at least ten years of continuous operations will be supported by the Mittens Foundation unless it shelters more than fifty animals."

would the answer be different (or I guess opposite)?

The reason why I'm asking is I don't know if I'm understanding after reading the explanation because I have the explanation, or if I am truly understanding it...