swerve wrote:A certain population of bacteria doubles every 10 minutes. If the number of bacteria in the population initially was 10^4, what was the number in the population 1 hour later?

A. 2(10^4)
B. 6(10^4)
C. (2^6)(10^4)
D. (10^6)(10^4)
E. (10^4)^6

The OA is C

Source: Official Guide

Let's list some populations and look for a pattern

Initial population: 10�
10 minutes later: (10�)(2)
20 minutes later: (10�)(2)(2)
30 minutes later: (10�)(2)(2)(2)
40 minutes later: (10�)(2)(2)(2)(2)
50 minutes later: (10�)(2)(2)(2)(2)(2)
60 minutes later: (10�)(2)(2)(2)(2)(2)(2) = (10�)(2�)

Answer: C

Cheers,
Brent

swerve wrote:A certain population of bacteria doubles every 10 minutes. If the number of bacteria in the population initially was 10^4, what was the number in the population 1 hour later?

A. 2(10^4)
B. 6(10^4)
C. (2^6)(10^4)
D. (10^6)(10^4)
E. (10^4)^6

The OA is C

Source: Official Guide

Since one hour has 6 ten-minute intervals, after one hour the population is 10^4 x 2^6.

Answer: C