Answer:
If A = {1,20,30..} and B = {4,6} find n(A-B)?
Step-by-step explanation:

Let the width be w, then length = 2w - 1
Area = length times width = w(2w - 1) = 21.
Thus, 2w^2 - w = 21 or 2w^2 - w - 21 = 0
Solving the quadratic equation gives that w = 3.5.
Therefore, width is 3.5 ft and length is 2(3.5) - 1 = 6 ft.
Step-by-step explanation:
it is option c. you interchange the value with y and take inverse.
Answer:
It should be 5x-6y=30
Step-by-step explanation: