Final answer:
The fraction of the trees that will be Oak, Willow, or Pine is 4/10.
Step-by-step explanation:
The park department has decided that 1/10 of the trees will be Oak, 3/10 will be Pine, and 2/10 will be Willow. The fraction of the remaining trees can be found by subtracting the sum of the fractions that have already been decided from 1.
To find the fraction of the remaining trees that will be Oak, Willow, or Pine, we subtract the sum of the fractions of the decided trees from 1:
Remaining fraction = 1 - (1/10 + 3/10 + 2/10)
Simplifying:
Remaining fraction = 1 - 6/10
Remaining fraction = 4/10
Therefore, the fraction of the trees that will be Oak, Willow, or Pine is 4/10.