For which pairs of functions is f(g(x))=x?
a) f(x)=x^2 and g(x)=1/x
b) f(x)=2/x and g(x)=2/x
c) f(x)x-2/3 and g(x)=2-3x
d) f(x)1/2x-2 and g(x)=1/2x+2

The correct answer is:

B) f(x)=2/x and g(x)=2/x

Explanation:

To perform this composition of functions, we take the value of g(x) for each choice and substitute it in place of x in f(x).  

For this one, we have f(x) = 2/x and g(x) = 2/x.  This means we replace x in f(x) with 2/x:

f(g(x)) = f(2/x) = 2/(2/x)

This can also be written as:

f(2/x) = 2÷(2/x) = (2/1)÷(2/x)

When dividing fractions, flip the second one and multiply:

f(2/x) = (2/1)×(x/2) = (2*x)/(1*2) = (2x)/2 = x

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation:

from the sentence, "tomorrow morning, akiko will arrive an hour late" depicts a third person perspective because it doesn't use any pronoun to replace akiko, the subject of the sentence, and it is in singular form since akiko is only one person.