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amid [387]
4 years ago
13

Explain how to add 678 + 303 using mental math

Mathematics
1 answer:
zloy xaker [14]4 years ago
4 0

Answer:

You add it in your mind.

Step-by-step explanation:


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Mario vende dos autos a 30 000 dólares cada uno. En la venta de uno ganó el 20% y en la
Mariana [72]

Answer:

Mario perdió dinero, perdió 2500 dólares

Step-by-step explanation:

En el primer caso, Mario está vendiendo su carro en 30 000 dólares. En otras palabras, el precio de venta es 30 000. Te dice que en el primer carro ganó 20%, o sea que su precio de venta es una incógnita que llamaremos x y gano 20% de x. Podemos expresarlo de esta manera

x = precio de compra carro 1

x + (20% de x) = 30 000

x = 100 % de x

(100% de x) + (20% de x) = 30 000

120% de x =30 000

120% = 1.2

1.2x = 30 000

x = 25 000

El segundo caso es bastante parecido. Te indica que el precio de venta sigue siendo el mismo, pero el precio de compra es diferente. El precio de venta sigue siendo 30 000, pero el precio de compra del segundo carro esta vez será "y". En este caso, pierde 20% del precio de compra, o osea, pierde 20% de y. Se puede expresar de la siguiente manera:

y = precio de compra carro 2

y - (20% de y) = 30 000

y = 100% de y

(100% de y) - (20% de y) = 30 000

80% de y = 30 000

80% = 0.8

0.8y = 30 000

y= 37 500

Entonces tenemos que el precio de compra del carro uno es 25 000 dólares y el precio de compra del carro dos es de 37 500. Si sumamos ambas cantidades, tenemos que ambos carros costaron 62 500 dólares. Como vendió esos dos autos a 30 000 dólares cada uno, recibió 60 000 dólares. El precio por el que vendió los autos (60 000) es menor al precio del que los compro (62 500), por lo que eso representa una perdida.

Para hallar la cantidad que ganó o perdió (en este caso perdió) debes restar el precio de venta menos el precio de compra.

60 000 - 62 500 = -2 500

Como es un número negativo, representa una perdida.

6 0
3 years ago
A rotation maps point A(5, 4) to A’(–4, 5).
Molodets [167]

90° counterclockwise rotation

8 0
4 years ago
1.) You go skiing on one route with an equation = 2 + 4 and then
CaHeK987 [17]

The best information that describes your routes is the second route was steeper than your first, and the second route was higher up the mountain.

<h3>What is the slope of a linear equation?</h3>

The slope of a linear equation is the change in the rise over the run. So, the slope of a linear equation shows that the larger the slope, the steeper the line becomes.

From the given information:

y = 2x + 4  --- (1)

y = 4x + 1  --- (2)

Using the slope-intercept formula:

y = mx + b

  • m = slope
  • b = y-intercept

From the first equation, the slope is 2 and in the second equation, the slope is 4.

Therefore, we can conclude that the second route was steeper than your first, and the second route was higher up the mountain.

Learn more about the slope of a linear equation here:

brainly.com/question/1884491

#SPJ1

3 0
2 years ago
What is the distance between the points (5, 7) and (-3, 4) on the coordinate
oksano4ka [1.4K]

Answer:

  1. 3.61unit .I hope the answer is correct. I hope I will get 5 points
8 0
3 years ago
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Find −30÷(6a)-30÷(6a) when a=−5a=-5 . Write the answer in simplest form
Scorpion4ik [409]
Instead of waiting for someone to answer you try mathway
6 0
3 years ago
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