SOLUTION: If in the expression x^2y the values of x and y are each decreased by 20%, then the value of the expression is decreased by a factor of A 61/125 b 50% c 64/125 d 60% e none

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Question 280517: If in the expression x^2y the values of x and y are each decreased by 20%, then the value of the expression is decreased by a factor of
A 61/125 b 50% c 64/125 d 60% e none of these

Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
the expression is x^2*y.

the values of x and y are each decreased by 20%.

the expression becomes:

(x-.2x)^2*(y-.2y)

this becomes:

(.8x)^2*(.8y) which becomes:

(.8)^2*x^2*(.8)*y which becomes:

(.8)^2*(.8)*x^2*y which becomes

(.8)^3*x^2*y which becomes:

.512*x^2*y.

.512 is equivalent to 64/125 so the answer is selection c.