If enough of the endangered trees were replanted, in order to classify them as threatened instead of endangered, how many total threatened tree species would there be?

To find out how many total threatened tree species there would be if enough endangered trees were replanted, you just need to add the numbers together.
1.Current threatened tree species: 4,200
2.Endangered tree species being replanted: 235
If all 235 endangered tree species that are being replanted successfully become classified as threatened, you would add these to the existing threatened species:
4,200(current threatened)+235(replanted)=4,435(total threatened species)
So, there would be 4,435 threatened tree species in total.