Answer:
He received 10 dimes and 15 quarters.
Step-by-step explanation:
Dimes = $0.10
Quarters = $0.25
Variable x = dimes
Variable y = quarters
Create a pair of linear equations:
0.10x + 0.25y = 4.75
x + y = 25
Isolate any variable, using an equation of your choice:
x + y = 25
x = 25 - y
Plug in this new value of x into the other equation:
0.10(25 - y) + 0.25y = 4.75
Use the distributive property:
2.5 - 0.10y + 0.25y = 4.75
Combine like terms:
2.5 + 0.15y = 4.75
Isolate variable y:
0.15y = 2.25
y = 15
Plug in the value of y into any equation:
x + y = 25
x + 15 = 25
Isolate variable x:
x = 10
Answer:
Sample response:
Step-by-step explanation:
She would multiply the rate by the years to find the average rise in water levels, or 1.8 times 6.2 = 11.16. To find the difference between the water levels, she would subtract -13.64 from 11.16.
Answer:
1,880.82
Step-by-step explanation:
Answer:
Volume = ![\pi r^2 h](https://tex.z-dn.net/?f=%5Cpi%20r%5E2%20h)
2512 = 3.14 × r^2 × 8
![r^2 = \displaystyle\frac{314}{3.14}](https://tex.z-dn.net/?f=r%5E2%20%3D%20%5Cdisplaystyle%5Cfrac%7B314%7D%7B3.14%7D)
![r^2 = 100](https://tex.z-dn.net/?f=r%5E2%20%3D%20100)
![r = 10 \ cm](https://tex.z-dn.net/?f=r%20%3D%2010%20%5C%20cm)
![Diameter = 2r = 20 \ cm](https://tex.z-dn.net/?f=Diameter%20%3D%202r%20%3D%2020%20%5C%20cm%20)
Dont get confused try to understand : )