What were some characteristics of the age of reason or enlightenment

Major themes of the enlightenment were reason, individualism, and skepticism. Enlightenment philosophes were challenging traditional religious views with their ideas, and they were typically humanists. Philosophes were skeptical of many things, such as religious dogma and even of the nature of what is real and what isn’t.

(4.2*10^-1)*(5.7*10^-1) = (4.2*5.7)*(10^-1 * 10^1)
23.94*10^-2 = .2394
moving the decimal one place to the left is the same thing as dividing by 10 or multiplying by
1/10. 2.394*10^-1, that is the answer you're looking for, B