Answer:
11 years old
Step-by-step explanation:
If four brothers have the average age 6, then the sum of their ages is

years.
Let x years be the age of sister. If four brothers and their sister have the average age 7, then

Multiply this equation by 5:

The sister is 11 years old.
The sum of b and f is b+f
Three times this sum is 3(b+f)
Answer:
Franklin's population < Chester's population by 4500
Step-by-step explanation:
Franklin: 20000 (1 + 0.05) = 21000 (21000 - 20000 = 1000 grew)
Chester: 25000 + 500 = 25500 (500 increase)
Answer:
I believe the answer would be B.
Step-by-step explanation:
The x on the left side of the chart is what you will plug into the function. For example for 0.
f(0) = 
So you just plug in the x into the function.