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In-s [12.5K]
3 years ago
7

48% of the students in the class play sports. 12 students in the class play sports , how many students are in the class?

Mathematics
2 answers:
Setler [38]3 years ago
3 0
The answer is 25 students.
Novay_Z [31]3 years ago
3 0
This problem is quite difficult if you don't remember a technique to solving it.
I will help teach you this tactic.
First, set the percentage over 100, which is 48/100 as a fraction (which is what "over 100" means).
Now, put 12 over x, which is the total amount of students in the class. It should look like this: 12/x.
Now that we've done this, set them up as a proportion.
Your proportion should be:
12/x = 48/100
This is where it becomes a little confusing if you do not remember this correctly.
Cross multiply the denominator (the bottom number of a fraction) of 12/x by the numerator (the top number of a fraction) of 48/100.
This number should be:
48x.
Now, cross multiply the denominator of 48/100 by the numerator of 12/x.
This number should be:
1200.
Our equation now is:
48x = 1200.
To solve for this, divide both sides by 48 to solve for x.
48x / 48 = x
1200 / 48 = 25.
Your equation and solved problem is:
There are 25 total students.
I hope this taught you something and I hope it's very helpful!
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nikklg [1K]

Answer:

cos(θ)

Step-by-step explanation:

Para una función f(x), la derivada es el límite de  

h

f(x+h)−f(x)

​

, ya que h va a 0, si ese límite existe.

dθ

d

​

(sin(θ))=(  

h→0

lim

​

 

h

sin(θ+h)−sin(θ)

​

)

Usa la fórmula de suma para el seno.

h→0

lim

​

 

h

sin(h+θ)−sin(θ)

​

 

Simplifica sin(θ).

h→0

lim

​

 

h

sin(θ)(cos(h)−1)+cos(θ)sin(h)

​

 

Reescribe el límite.

(  

h→0

lim

​

sin(θ))(  

h→0

lim

​

 

h

cos(h)−1

​

)+(  

h→0

lim

​

cos(θ))(  

h→0

lim

​

 

h

sin(h)

​

)

Usa el hecho de que θ es una constante al calcular límites, ya que h va a 0.

sin(θ)(  

h→0

lim

​

 

h

cos(h)−1

​

)+cos(θ)(  

h→0

lim

​

 

h

sin(h)

​

)

El límite lim  

θ→0

​

 

θ

sin(θ)

​

 es 1.

sin(θ)(  

h→0

lim

​

 

h

cos(h)−1

​

)+cos(θ)

Para calcular el límite lim  

h→0

​

 

h

cos(h)−1

​

, primero multiplique el numerador y denominador por cos(h)+1.

(  

h→0

lim

​

 

h

cos(h)−1

​

)=(  

h→0

lim

​

 

h(cos(h)+1)

(cos(h)−1)(cos(h)+1)

​

)

Multiplica cos(h)+1 por cos(h)−1.

h→0

lim

​

 

h(cos(h)+1)

(cos(h))  

2

−1

​

 

Usa la identidad pitagórica.

h→0

lim

​

−  

h(cos(h)+1)

(sin(h))  

2

 

​

 

Reescribe el límite.

(  

h→0

lim

​

−  

h

sin(h)

​

)(  

h→0

lim

​

 

cos(h)+1

sin(h)

​

)

El límite lim  

θ→0

​

 

θ

sin(θ)

​

 es 1.

−(  

h→0

lim

​

 

cos(h)+1

sin(h)

​

)

Usa el hecho de que  

cos(h)+1

sin(h)

​

 es un valor continuo en 0.

(  

h→0

lim

​

 

cos(h)+1

sin(h)

​

)=0

Sustituye el valor 0 en la expresión sin(θ)(lim  

h→0

​

 

h

cos(h)−1

​

)+cos(θ).

cos(θ)

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3 years ago
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