Solution:
Given:

To find f(g(x)):

Therefore, f(g(x)) = 3x + 5
To find g(f(x)):

Therefore, g(f(x)) = 3x + 1
Answer:
A.3
Step-by-step explanation:
the key word is Congruent ^_^
Answer: Multiply the divisor and dividend by 10
Total students = 28
Students with brown eyes = 19
students wear glasses = 13
Not brown eyes or no glasses = 7
Not brown eyes = 28 - 19 = 9
Not wearing glasses = 28 - 13 = 15
Not brown eyes and wearing glasses = 15 - 9 = 6
Brown eyes and wearing glasses = 13 - 6 = 7 <==== answer