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2 years ago

Un profesor realiza una prueba con 70 preguntas, cada una con igual valor. Un

Mathematics

1 answer:

Valentin [98]2 years ago

3 0

Tenemos un problema sobre porcentajes. Veremos que la calificación del alumno es un 80%.

En este caso sabemos que la prueba tiene 70 preguntas, por lo que la cantidad de referencia (el 100%) será 70.

Y sabemos que el estudiante responde correctamente 56 preguntas.

Lo que queremos hacer es ver que porcentaje representa este segundo número.

Para ver esto planteamos dos ecuaciones:

56 = x

70 = 100%

Para resolver esto, debemos ver el cociente entre esas ecuaciones:

56/70 = x/100%

Ahora resolvemos para x:

(56/70)*100% = x = 80%

Es decir, el alumno obtiene una clasificación del 80%.

Si quieres aprender más puedes leer:

brainly.com/question/18546712

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rjkz [21]

Answer:

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Step-by-step explanation:

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3 years ago

Consider the line y=1 x -1 and the point P=(2,0).

Montano1993 [528]

Answer:

Step-by-step explanation:

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=√((x-2)²+y²)

=√((x-2)²+(x-1)²)

=√(x²-4x+4+x²-2x+1)

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3 years ago

What is the area of the square?

NISA [10]

The area is 4 square meters, because 2x2 would be 4

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3 years ago

An airplane is flying from New York City to Los Angeles the distance it travels in Miles D is related to the time in seconds T b

tatiyna

Answer:

It takes 85 seconds to go 12.75 miles

Step-by-step explanation:

We are given

An airplane is flying from New York City to Los Angeles

the distance it travels in Miles D is related to the time in seconds T by the equation

$d=0.15T$

we are given to find time when distance is 12.75 miles

so, we can set d=12.75

and then we can solve for T

$12.75=0.15T$

We can divide both sides by 0.15

$T=\frac{12.75}{0.15}$

$T=85$

So,

It takes 85 seconds to go 12.75 miles

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3 years ago

At a baseball game, a vender sold a combined total of 170 sodas and hot dogs. the number of hot dogs sold was 50 less than the n

Juliette [100K]

Let the number of sodas sold be x and the number of hotdogs sold be y. We can assemble a system of equations from the information given and solve.

x+y=170 (We know that soda + dogs is 170)

x-50=y (We know that dogs is equal to 50 less than sodas)

We can use substitution to solve this system of equations.

x+y=170

Sub in the value of y from the second equation

x+(x-50)=170

2x-50=170

2x=220

x=110

We now know the number of sodas sold was 110. Lets now plug this value into the equation to solve for y.

x+y=170

110+y=170

y=60

So, there were 60 hotdogs sold and 110 sodas sold.

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3 years ago