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anonymous
 one year ago
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anonymous
 one year ago
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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What will be the perimeter and the area of the rectangle below if it is enlarged using a scale factor of 4.5? A rectangle is shown. The length of the rectangle is labeled as 8 cm, and the width is labeled as 6 cm. Perimeter = 46 cm, area = 131.25 cm2 Perimeter = 126 cm, area = 972 cm2 Perimeter = 46 cm, area = 972 cm2 Perimeter = 126 cm, area = 131.25 cm2 got anything?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1use implicit differentiation

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Is that when you set it equal to y and then derive it?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1find the derivative with respect to x term by term

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So I would get 2x=lnxy first correct?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1you treat y as a function of x

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1the 2x is correct but you use the Chain and product Rules to differentiate the right side

welshfella
 one year ago
Best ResponseYou've already chosen the best response.12x = (1/ (xy) * (x dy/dx + y) now you make dy/dx the subject

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What do you mean by make it the subject? Like solve for that?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1dw:1435856245509:dw

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1yes solve for dy/dx

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Would it be 2x^2y=dy/dx?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1dy/dx = y( 2x + 1/x)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1sorry that's dy/dx = y (2x  1/x)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Okay and then with that would I plug in the given values?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1yes plug in x = 1 and y = e

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So it would just equal e correct?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1dy/dx = e(2  1/e) = 2e  1

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0You divided by e when you should divide by x, which is 1.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1oh so I did!! your are correct its e

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Okay thank you so much for you help!!!
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