Assuming x = nickels, y = quarters
![x + y = 40 \\ 0.05x + 0.25y = 5.20](https://tex.z-dn.net/?f=x%20%2B%20y%20%3D%2040%20%5C%5C%200.05x%20%2B%200.25y%20%3D%205.20)
![x + y = 40 \\ x = 40 - y](https://tex.z-dn.net/?f=x%20%2B%20y%20%3D%2040%20%5C%5C%20x%20%3D%2040%20-%20y)
Substitute that into
![0.05(40 - y) + 0.25y = 5.20 \\ 2 - 0.05y + 0.25y = 5.20 \\ 0.2y = 3.20 \\ y = 16](https://tex.z-dn.net/?f=0.05%2840%20-%20y%29%20%2B%200.25y%20%3D%205.20%20%5C%5C%202%20-%200.05y%20%2B%200.25y%20%3D%205.20%20%5C%5C%200.2y%20%3D%203.20%20%5C%5C%20y%20%3D%2016)
Substitute that into
![x + 16 = 40 \\ x = 24](https://tex.z-dn.net/?f=x%20%2B%2016%20%3D%2040%20%5C%5C%20x%20%3D%2024)
Answer : He has 24 nickels.
Hope this helps. - M
Answer:
4 ⅓
Step-by-step explanation:
10 - 5 ⅔
10 - 5 × 3 + 2/3
10 - 17/3
3 × 10 - 17/3
30 - 17/3
13/3 = 4 ⅓
<u>-TheUnknownScientist</u>
Answer:
2.5 is a rational number which is not an integer. A rational number is a number which can be written as a ratio of two whole numbers (integers). For example 5 is a rational number since 5 can be written as ratio of 5 : 1 . 5 is also an integer.
Step-by-step explanation:
w=3
4w^2-7w-8
4*3^2-7*3-8
4*9-21-8
4*9-29
36-29
7
hope this helps