1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
melamori03 [73]
2 years ago
10

Un grupo de clientes compró 8 hamburguesas Deluxe, 6 órdenes de papas fritas y 6 refrescos grandes por $26.10. Un segundo grupo

ordenó 10 hamburguesas Deluxe, 6 papas fritas y 8 refrescos grandes y pagó $31.60. ¿Es suficiente información para determinar el precio de cada artículo de comida? Si no, considera que las hamburguesas cuesten entre $1.75 y $2.25, las papas fritas entre $0.75 y $1.00 y los refrescos entre $0.60 y $0.90. Para resolver el problema, determina el precio exacto de los tres productos.
Mathematics
1 answer:
EastWind [94]2 years ago
4 0

El precio exacto de cada uno de los tres productos es:

  • Hamburguesa Deluxe = <em>$2.10</em>
  • Papas fritas = <em>$0.65</em>
  • Refresco = <em>$0.90</em>

<em>Identificación de </em><em>variables</em><em>.</em>

Para calcular más fácilmente los valores de cada artículo, se procede a dar <em>variables</em> que representa a cada uno:

  • H = <em>Precio de cada hamburguesa Deluxe.</em>
  • P = <em>Precio de cada porción de papas fritas.</em>
  • R = <em>Precio de cada refresco.</em>

<em>Elaboración de </em><em>ecuaciones</em><em>.</em>

<em><u>Para calcular un cierto número de incógnitas, se debe tener el mismo número de ecuaciones</u></em>, por lo tanto, como en el ejercicio se tiene 3 incógnitas (H, P y R), se deben crear el mismo número de ecuaciones.

La primera ecuación se crea con los datos del primer grupo de clientes mencionado:

  • <u>8H + 6P + 6R = 26.10</u>

La segunda ecuación se crea con el pedido del segundo grupo:

  • <u>10H + 6P + 8R = 31.60</u>

Y para la tercera, se toma un valor exacto para uno de los productos, de entre los rangos dados, ya que se conoce que la hamburguesa cuesta entre $1.75 y $2.25, se procede a tomar un valor entre este rango:

  • <u>H = $2.10</u>

Utilizando el método de reducción, se le resta a la segunda ecuación la primera, multiplicando por (-1) la primera ecuación:

  • <em>10H + 6P + 8R = 31.60</em>
  • <em>- 8H - 6P - 6R = - 26.10</em> (ya multiplicada por -1)

Con lo cual se obtiene la siguiente ecuación:

  • <em>2H + 2R = 5.5</em>

Como ya se tiene un valor para H (2.10), se procede a reemplazar y a despejar R:

  • <em>2 (2.10) + 2R = 5.5</em>
  • <em>4.20 + 2R = 5.5</em>
  • <em>2R = 5.5 - 4.20</em>
  • <em>2R = 1.30</em>
  • <em />R = \frac{1.30}{2}<em />
  • <u>R = 0.65</u>

Ya que el valor de los refrescos se encuentra dentro del rango dado ($0.60- $0.90), por el momento se asume que es correcto, ahora <u><em>se procede a despejar el valor de P con la primera ecuación</em></u>:

  • <em>8H + 6P + 6R = 26.10</em>
  • <em>8 (2.10) + 6P + 6 (0.65) = 26.10</em>
  • <em>16.80 + 6P + 3.90 = 26.10</em>
  • <em>6P = 26.10 - 16.80 - 3.90</em>
  • <em>6P = 5.40</em>
  • <em />P = \frac{5.40}{6}<em />
  • <u>P = 0.90</u>

Ya que el precio de las papas fritas también se encuentra dentro del rango dado ($0.75 - $1.00), se considera que los precios de cada producto son:

  • Hamburguesa Deluxe = <em>$2.10</em>
  • Papas fritas = <em>$0.65</em>
  • Refresco = <em>$0.90</em>

Si quieres ver otro ejemplo con el método de reducción, puedes visitar el siguiente enlace: brainly.com/question/16568762?referrer=searchResults

You might be interested in
You're an aeronautical engineering student, and you have been awarded a "Co-op" job at NASA in your junior year of your 4-year p
postnew [5]

Answer:

$85,000

Step-by-step explanation:

8 0
3 years ago
The door on a model building is 10 inches tall. The door on the actual building is 4 yards tall. What was the scale used?
pychu [463]
The scale is 14.4 inches = 1 yard
3 0
3 years ago
The figure is a square. Find the length of side x in simplest radical form with a rational denominator.
nika2105 [10]

Answer:

10\sqrt{2}

Step-by-step explanation:

The diagonal of any square with side length s is equal to s\sqrt{2}. Since the side length of the square is 10, the diagonal must be \boxed{10\sqrt{2}}.

To support and prove this:

The diagonal creates two 45-45-90 triangles, with the diagonal being the hypotenuse of both of these triangles. The Pythagorean Theorem states that in any triangle, the sum of the squares of both legs is equal to the square of the hypotenuse (a^2+b^2=c^2).

Call the diagonal d. In these two triangles, both legs are equal to 10 (the side lengths of the square), and the hypotenuse is the diagonal. Thus, we have:

10^2+10^2=d^2,\\100+100=d^2,\\d^2=200,\\d=\sqrt{200}=\sqrt{100}\cdot \sqrt{2}=\boxed{10\sqrt{2}}

4 0
3 years ago
Read 2 more answers
Dylan takes out a bank loan of $11,500 at 3.8% interest compounded annually. How much interest, in dollars, will he owe after 3
sergejj [24]

Answer:

3.8% of 11,500 is 437 so then we would multiply 437 by 3 and get $1,311 then round and get $1,300, I don't if this is right.

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes
vesna_86 [32]

Answer:

A) P=2.28%

B) P=28.57%

C) I expect 10 students to be unable to complete the exam in the alloted time.

Step-by-step explanation:

In order to solve this problem, we will need to find the respective z-scores. The z-scores are found by using the following formula:

z=\frac{x-\mu}{sigma}

Where:

z= z-score

x= the value to normalize

\mu = mean

\sigma= standard deviation

The z-score will help us find the area below the normal distribution curve, so in order to solve this problem we need to shade the area we need to find. (See attached picture)

A) First, we find the z-score for 60 minutes, so we get:

z=\frac{60-80}{10}=-2

So now we look for the z-score on our normal distribution table. Be careful with the table you are using since some tables will find areas other than the area between the mean and the desired data. The table I used finds the area between the mean and the value to normalize.

so:

A=0.4772 for a z-score of -2

since we want to find the number of students that take less than 60 minutes, we subtract that decimal number from 0.5, so we get:

0.5-0.4772=0.0228

therefore the probability that a student finishes the exam in less than 60 minutes is:

P=2.28%

B) For this part of the problem, we find the z-score again, but this time for a time of 75 minutes:

z=\frac{75-80}{10}=-0.5

and again we look for this z-score on the table so we get:

A=0.1915 for a z-score of -0.5

Now that we got this area we subtract it from the area we found for the 60 minutes, so we get:

0.4772-0.1915=0.2857

so there is a probability of P=28.57% of chances that the students will finish the test between 60 and 75 minutes.

C) Finally we find the z-score for a time of 90 minutes, so we get:

z=\frac{90-80}{10}=1

We look for this z-score on our table and we get that:

A=0.3413

since we need to find how many students will take longer than 90 minutes to finish the test, we subtract that number we just got from 0.5 so we get:

0.5-0.3413=0.1586

this means there is a 15.86% of probabilities a student will take longer than 90 minutes. Now, since we need to find how many of the 60 students will take longer than the 90 available minutes, then we need to multiply the total amount of students by the percentage we previously found, so we get:

60*0.1586=9.516

so approximately 10 Students will be unavailable to complete the exam in the allotted time.

3 0
4 years ago
Read 2 more answers
Other questions:
  • If U = {all positive integers} and A = {x|x ∈ U and x is an odd positive integer}, which describes Ac?
    12·2 answers
  • What is the slope of the line that has a equation of y=x-3
    12·1 answer
  • What are the solution of the equation 2|×+7|-3=5​
    15·2 answers
  • Find the volume and tell me if cavalieri's principle applies to the figure<br> Need answer ASAP
    5·1 answer
  • Which function is equivalent to y=3(x+2)^2+7
    14·1 answer
  • If an elephant could eat 2,500 pounds of food in 10 days how much can it eat in 1,000 days
    12·1 answer
  • Given the following set of grammar test scores, what
    8·1 answer
  • Select the positive or negative integer for the situation.
    14·2 answers
  • What is the angle for the question mark of each question?
    14·1 answer
  • Examples! Write the equation that this model represents: <br>​
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!