Let x be the number of bushels. Given that 1 bushel \(= 42\) pounds, then the expression to find the number of pounds is to multiply 42 pounds by the number of bushels:
One tree can produce 6 bushels and there are 100 trees produced so the total number of bushels is:
\(x=6 \cdot 100=600\)
Using the expression above, we have \(42(600)=25200\) pounds of apples.