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alukav5142 [94]
2 years ago
11

Farmer rusty nales has a total of 25 chickens and cows on his farm. How many of the aches animals does he have if all together t

here are 76 legs,
Write a system of equations for each equation
Solve using substitution or elimination
Mathematics
1 answer:
emmainna [20.7K]2 years ago
8 0

Answer:

13 cows, 12 chickens

Step-by-step explanation:

Total number of animals= 25

Total number of legs= 76

Let the number of cows be x and the number of chickens be y.

x +y= 25 -----(1)

Since each cow has 4 legs and each chicken has 2 legs,

4x +2y= 76 -----(2)

The second equation can be simplified by dividing both sides of the equation by 2:

2x +y= 38 -----(3)

Let's solve by elimination!

(3) -(1):

2x +y -(x +y)= 38 -25

Expand:

2x +y -x -y= 13

x= 13

Substitute x= 13 into (1):

13 +y= 25

y= 25 -13

y= 12

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A metallic sphere is immersed in water in a cylindrical container causing a rise in the level of water by 7.5cm if the cylinder
SVETLANKA909090 [29]

Answer:

6.51 cm

Step-by-step explanation:

Since the sphere causes the water level in the cylindrical container to rise and thus increase by its own volume, the volume of the sphere is V = 4πr³/3 where r = radius of sphere. The volume rise of the container is thus    V' = πR²h where R = radius of base of cylinder = 7 cm and h = height of water level = 7.5 cm.

Since V = V',

4πr³/3 = πR²h

dividing through by π, we have

4r³/3 = R²h

multiplying both sides by 3/4, we have

r³ = 3R²h/4

taking cube-root of both sides, we have

r = ∛(3R²h/4)

Substituting the values of the variables into the equation, we have

r = ∛(3(7 cm)² × 7.5 cm/4)

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