In the formula V = 1/(2r)^3, if r is halved then V is multiplied by
A) 64
B) 8
C) 1
D) 1/8
E) 1/64
A) 64
B) 8
C) 1
D) 1/8
E) 1/64
A quick approach here is to plug in a "nice" number.BlueDragon2010 wrote:In the formula V = 1/(2r)³, if r is halved then V is multiplied by
A) 64
B) 8
C) 1
D) 1/8
E) 1/64
Let's plug in r = 1. We get V = 1/[(2)(1)]³ = 1/8
Now let's see what happens when we HALVE r. In other words, we'll plug in r = 1/2.
We get V = 1/[(2)(1/2)]³ = 1
So, when r = 1, V = 1/8, and when r = 1/2, V = 1.
So, when we halve r, V is multiplied by 8
Answer = B
Cheers,
Brent
