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.
Answer:
Following are the solution to the given question:
Step-by-step explanation:
For question 1:
Calculating the speed between A and B:
For question 2:
Calculating the speed between B and C:
For question 3:
In this the speed between A and B is the double to speed between B and C.
Answer:
Step-by-step explanation:
A rational number are numbers that can be expressed as as fraction. They can be expressed as a ratio of two integers. An irrational is quite the opposite. An irrational number cannot be expressed as a ratio of two integers.
Taking square root of two as an example;
√2 cannot be expressed as a ratio of two integers because the result will always be a decimal. If expressed as √2/1, it is still not a rational number because of the square root of 2 at the numerator. Square root of 2 is not an integer even though 1 is an integer.
Mark is wrong because √2 is irrational and it is irrational because it cannot be expressed as a ratio of two integers <em>not due to the fact that he can write it as a fraction.</em>
Answer:
It is 3 2/3 away from zero or 3.7 (3.66666666667) away from zero.
Step-by-step explanation:
It is 3 2/3 away from zero or 3.7 (3.66666666667) away from zero.