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# Identify the radius of the circle whose equation is (x - 2)2 + (y - 8)2 = 16.

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Identify the radius of the circle whose equation is (x - 2)2 + (y - 8)2 = 16.

A)2

B)4

C)8

D)16

A standard deck of cards is made up of four suits: diamonds, spades, hearts, and clubs. What is the probability that you draw a diamond or spade from a standard deck of cards?

A)

1/8

B)

1/4

C)

1/2

D)

2/3

jbouyer  May 16, 2017
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The standard form for the equation of a circle is (x - h)2 + (y - 8)2 = r2    ...where (h, k) is the center of the circle and r is the radius.

So...in this equation: (x - 2)2 + (y - 8)2 = 16

16 = r2

√16 = r

4 = r

2 out of 4 suits are diamonds OR spades...so there is a 2/4 probability of drawing a diamond OR a spade.

2/4 = 1/2

hectictar  May 16, 2017

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