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-BARSIC- [3]
4 years ago
6

. Three students simplified the expression: 2x-3(y- 2x) + (-5)(-2y). Their answers are below. Amber: -4x + 7y Butch: 4x+ 7yCarl:

8x +7yTell who is correct. Explain the error the other students made.
Mathematics
1 answer:
Stolb23 [73]4 years ago
5 0

Answer:

Butch is correct. Amber was incorrect because -6x-2x=(-4x)

She had a positive 4.

Carl was incorrect because he made an error in his subtracting. -3y-(-10y)=7y

Step-by-step explanation:

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tresset_1 [31]

Answer:

x=13

Step-by-step explanation:

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3 years ago
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CUALES SON LOS GRADOS PARA HACER UNA GRAFICA DE PASTEL, CON LOS SIGUIENTES PORCENTAJES( 20%,50%,10%)
svlad2 [7]

Answer:

Lo primero que debemos saber, es que la gráfica de pastel nos permite dividir a una población, la cual sería el 100%, en porcentajes menores que representan algo.

En este caso tenemos los porcentajes 20%, 50%, 10%  (notar que no suman 100%, entonces nos falta algún porcentaje)

Bueno, como sabemos el gráfico (el cual es un círculo) representa el 100%.

Y en un círculo, tenemos un ángulo de 360°

Entonces comenzamos con la equivalencia:

360° = 100%

Entonces, ¿a que grado corresponde el 50%? Planteamos la ecuación:

x = 50%

Si tomamos el cociente entre las ecuaciones:

x = 50% y  360° = 100%

obtenemos:

x/360° = 50%/100%

resolviendo para x, obtenemos:

x = (50%/100%)*360° = 0.5*360° = 180°

Para los otros porcentajes hacemos lo mismo.

Para el de 20% tenemos:

y = 20%

planteamos la ecuación:

y/360° = 20%/100%

y = 0.2*360° = 72°

Finalmente, para el de 10% tendremos:

z = 10%

planteando la ecuación como antes:

z/360° = 10%/100%

z = 0.1*360 = 36°

Asi, hemos encontrado los grados correspondientes para cada porcentaje.

8 0
3 years ago
Xavier climbs 9ft up into an apple tree what integer represents the directions and how far he will climb to get back down to the
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Answer:

<h2>Direction is represented by +9, indicating that is moving in a positive direction (upwards).</h2><h2>Zero is the reference point.</h2>

Step-by-step explanation:

So, basically, we need to apply a reference system to express directions, because all movements are represented respect to a reference point. In this case, number zero represents that reference point, which is located in the ground, setting this reference point we can measure the distance that Xavier traveled upwards the apple tree.

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4 years ago
What is the GCF of 16s3t, 40s5, and 68t2?<br> 4<br> 4s3t<br> 8<br> 8s3t
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Step-by-step explanation:

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A group of 45 students went to the space museum. Tickets cost $11 for each
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