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

#1**+2 **

The standard form for the equation of a circle is (x - h)^{2} + (y - 8)^{2} = r^{2} ...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 = r^{2}

√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