The average (arithmetic mean) of four numbers is 4a + 16. When a fifth number is added, the average becomes 5a + 20. The fifth n
1 answer:
Answer:
Step-by-step explanation:
The average (arithmetic mean) of four numbers is 4a + 16. When a fifth number is added, the average becomes 5a + 20.
The average (arithmetic mean) of four numbers is 4a + 16.
Sum of 4 numbers = 4 times the average
Sum of 4 numbers =
sum of 5 numbers = 5 times the average of 5 numbers
Sum of 5 numbers =
fifth number = sum of 5 numbers minus the sum of 4 numbers
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Answer:
3. 3 : 5; 3: 5
Step-by-step explanation:
First, let's find the leght of the sides of each octagon.
The area of an octagon is defined by
Replacing the area
Therefore, the side of the first octagon is 1.6 inches long.
Its perimeter is:
Therefore, the side of the second octagon is 3.8 inches long.
Its perimeter is .
Now, let's divide to find each ratio:
(the ratio between sides).
(the ratio between perimeters).
Therefore, the closest ratio is 3. 3 : 5; 3: 5