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) (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.
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