Final answer:
To find the number of acres that are not federally owned in the large western state, multiply the total land area by the percentage of federally owned land and subtract it from the total land area.
Step-by-step explanation:
To find the number of acres that are not federally owned in the large western state, we need to calculate 100% minus 18%, which represents the federally owned land. First, we find 18% of 3569 million acres by multiplying 3569 million by 0.18. This gives us 642.42 million acres. Then, we subtract this amount from the total land area to find the number of acres that are not federally owned. Thus, the number of acres that are not federally owned is 3569 million minus 642.42 million, which equals 2926.58 million acres.