To the factor, a monomial means to express it as a product of two or more monomials. For example, below are several possible factorizations of 8 x 5 8x^5 8x58, x, start superscript, 5, end superscript.
Simply will say 4000(3.5%) = 140 km^2 So each year will decrease by 140km^2 To find till 9th years it will be 4000-(140*9)=2740 km^2 Area after 9 years is 2740 km^2