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zheka24 [161]
3 years ago
15

Since 2005 the amount of money spent at restaurants in a certain country has increased at a rate of 8% each year. in 2005, about

$280 billion was spent at restaurants. if the trend continues, about how much will be spent at restaurants in 2015?
Mathematics
1 answer:
ale4655 [162]3 years ago
5 0
1.8 x 280billion ok use a calculator
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Answer: a. Radius of circle = \sqrt{85}

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Step-by-step explanation:

Given : Center of the circle = (3,10)

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a. To find the radius we apply distance formula (∵ Radius is the distance from center to any point ion the circle.)

Radius of circle = \sqrt{(12-3)^2+(12-10)^2}

Radius of circle = \sqrt{(9)^2+(2)^2}=\sqrt{81+4}=\sqrt{85}

i.e. Radius of circle = \sqrt{85}

b. Equation of a circle = (x-h)^2+(y-k)^2=r^2 , where (h,k)=Center and r=radius of the circle.

Put the values of (h,k)= (3,10) and r= \sqrt{85} , we get

(x-3)^2+(y-10)^2=(\sqrt{85})^2

(x-3)^2+(y-10)^2=85

∴  The equation of this circle :(x-3)^2+(y-10)^2=85

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