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.
Answer: 4n -7
Sam has 4 times than Declan so it would 4n. Amaya has fewer so then you would add the -7 and the equation you get is 4n - 7.
Answer:$9.49
Step-by-step explanation:
8.95×.61=5.4595
8.95×.45=4.0275
5.4595+4.0275= 9.49(rounded answer)
Copy an angle by creating acts with a compass