Question

Umm so guys I got an F on a test today but idk y because there were all questions and then all of them were for example 2+5=_ so underscore was the answer. Then I looked for other questions without the underscore but they all had it so I thought maybe mine was accidently the answer key. So I went over it with pencil to make it look like my work, and then I turned it in and I got an F...WHY IS THAT!!

Answer 1

It could be because they knew it was an answer key because it is somewhat easy to tell pencil form print or they knew the lost the key. It also could’ve been a test to see if you would turn it in