Answer:
Roger's farm have initially 204 orange trees.
Explanation:
Consider the provided information.
Roger had a farm with a certain number of orange trees. Each of the remaining trees produced 210 oranges, producing a total harvest of 41,790 oranges.
Now, to find the number of trees simply divided the total oranges with 210.
Number of trees =

=

Thus, right now Roger had 199 orange trees.
He had to cut down 5 trees to control the insects.
To calculate the total number of trees roger's farm have initially, add 199 with 5.
199 + 5 = 204
Hence, Roger's farm have initially 204 orange trees.