Answer:
Davide's age is 10.
L'età di Davide è 10.
Step-by-step explanation:
The average age of Aldo, Bruno, Carlo and Davide is 16 years.
I am going to say that:
x is Aldo's age.
y is Bruno's age.
z is Carlo's age.
w is Davide's age.
Average of the 4 is 16 years.
This means that:
![16 = \frac{x + y + z + w}{4}](https://tex.z-dn.net/?f=16%20%3D%20%5Cfrac%7Bx%20%2B%20y%20%2B%20z%20%2B%20w%7D%7B4%7D)
![x + y + z + w = 64](https://tex.z-dn.net/?f=x%20%2B%20y%20%2B%20z%20%2B%20w%20%3D%2064)
If we do not consider Davide, the mean is 18. So
![18 = \frac{x + y + z}{3}](https://tex.z-dn.net/?f=18%20%3D%20%5Cfrac%7Bx%20%2B%20y%20%2B%20z%7D%7B3%7D)
![x + y + z = 54](https://tex.z-dn.net/?f=x%20%2B%20y%20%2B%20z%20%3D%2054)
Replacing in the first equation:
![x + y + z + w = 64](https://tex.z-dn.net/?f=x%20%2B%20y%20%2B%20z%20%2B%20w%20%3D%2064)
![54 + w = 64](https://tex.z-dn.net/?f=54%20%2B%20w%20%3D%2064)
![w = 10](https://tex.z-dn.net/?f=w%20%3D%2010)
Davide's age is 10.
L'età di Davide è 10.
^^To solve you must use the fractional exponent rule.
I dont quite understand what the question is asking but thats what I have to help :)
Answer:
Formula to find exterior angles =360°÷number of sided polygon
Step-by-step explanation:
360°/16
=22.5°
Answer:
D
(Please vote me Brainliest if this helped!)
Step-by-step explanation:
The angle shown is a right angle. Right angles have a total of 90°.
Therefore, I simply multiplied each answer by 4 because 4(x) = (answer).
A. 4 (14) = 56 + 42 = 98° ≠ 90° INCORRECT
C. 4 (10) = 40 + 42 = 82° ≠ 90° INCORRECT
B. 4 (16) = 64 + 42 = 106° ≠ 90° INCORRECT
D. 4 (12) = 48 + 42 = 90° = 90° CORRECT
An easier way to solve this problem is by simply just subtracting and dividing:
90 - 42 = 48
48 ÷ 4 = 12