A gardener is asked to plant ten trees in five rows, with
each row containing four
trees. How did he do this?

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.

Im not really sure if you add or something is that all it says