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January 27, 2015

January 27, 2015

Posted by **Jane** on Friday, March 1, 2013 at 5:20pm.

What is the area of the part of the field that is not blacktop? (I believe the answer is 69x^2)

There is a circular fountain in the rectangular field that has a radius of 3x. What is the area of the part of the field that does not include the blacktop of the fountain? Factor your answer. (Please show me how to set up and solve) Thanks

- math -
**Steve**, Friday, March 1, 2013 at 5:40pm5x3 = 15

12x7 = 84

84-15 is 69, so you are corect

area of circle is pi(3x)^2 = 9pi x^2

so, subtract: 84x^2 - 9pi x^2 = (84-9pi)x^2

- math -
**jason**, Saturday, March 9, 2013 at 1:24pmthe factor of part b. would end up being 3x^2(23-3pi). because you would have to bring down the area of part a. which would be 69x^2 with the 9pix^2 not 84, therefore, giving the factored solution of 3x^2(23-3pi). 3 is the gcf because 69 cannot and 9 cannot be multiplyed to obtain each with the same nuber other than 3.

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