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
Vladimir79 [104]
3 years ago
12

Por una calculadora y un cuaderno habríamos pagado, hace tres días, 10,80 €. El precio de la calcula-dora ha aumentado un 8%, y

el cuaderno tiene una rebaja del 10%. Con estas variaciones, los dos artículos nos cuestan 11,34 €. ¿Cuánto costaba cada uno de los artículos hace tres días?
Mathematics
1 answer:
Inessa05 [86]3 years ago
4 0

Answer:

La calculadora y el cuaderno costaba 9 y 1,8 euros hace tres días.

Step-by-step explanation:

A partir del enunciado podemos construir el sistema de ecuaciones lineales:

Hace tres días:

x+y = 10.80 (1)

Actualmente:

1.08\cdot x + 0.9\cdot y = 11.34 (2)

Donde:

x - Precio de la calculadora.

y - Precio del cuaderno.

Por métodos algebraicos, tenemos que el sistema de ecuaciones tiene la siguiente solución:

x = 9, y = 1.8

La calculadora y el cuaderno costaba 9 y 1,8 euros hace tres días.

You might be interested in
Factorise this equation 12ax+8bx​
aliya0001 [1]

Answer:

4x(3a+2b)

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
A preliminary study conducted at a medical center in St. Louis has shown that treatment with
mr Goodwill [35]
D I got the phone call back in the phone with me a couple
7 0
3 years ago
A polling company took before an 5 polls in the week that a mayoral 66%,56%, 55%, 60% 63% of the total votes. That candidate rec
kap26 [50]

Answer:

6.7%

Step-by-step explanation:

In this question, we are to calculate the percentage error in in the average polling results calculated.

Firstly, what this means is that we calculate the average of the total votes.

That would be ; (66 + 56 + 55 + 60 + 63)/5 =

300/5 = 60%

we now proceed to calculate the percentage error in the company’s result.

Mathematically;

percentage error = (Actual value - expected value)/expected value * 100%

Here the actual value is 64% and the expected is 60%

% error = (64-60)/60 * 100 = 4/60 * 100 = 6.67%

This is 6.7% to the nearest tenth of a percent

6 0
3 years ago
Consider the NASCAR race, the Indianapolis 500. Its name refers to the total race distance of 500 miles. There are 44 cars are r
lukranit [14]

Answer: $5289.35

Step-by-step explanation:

Since the cars have an average mileage of 6.78 miles per gallon and the race is 500 miles, the number of gallons each car will take will be:

= 500/6.78

= 73.75 gallons

Since they're 44 cars, the total gallons of fuel will be:

= 44 × 73.75

= 3245 gallons

Since the fuel cost is $1.63 per gallon, the total fuel cost, will be:

= $1.63 × 3245

= $5289.35

8 0
3 years ago
If P = (2,-1), find the image
mojhsa [17]

9514 1404 393

Answer:

  P'(-1, -2)

Step-by-step explanation:

The transformation for 270° CCW rotation is ...

  (x, y) ⇒ (y, -x)

Then the image of the given point is ...

  P(2, -1) ⇒ P'(-1, -2)

8 0
3 years ago
Other questions:
  • the "body" of a soda can (in between the lid and the bottom) is a cylinder. If the body is about 4.5 inches tall with a diameter
    8·1 answer
  • The length of an arc of a circle is equal to 1/5 of
    8·2 answers
  • Help needed please explain how this should be solved it will be appreciated!!
    7·1 answer
  • using the numbers 5, 8, and 24, create a problem using no more than four operations (addition, subtraction, division, square, sq
    11·1 answer
  • Which of the expressions are equivalent to the one below? Check all that
    14·1 answer
  • What is the area for a circle with a diameter of 4*
    7·2 answers
  • HELPPPPSSSSSS MEEE<br> (15 POINTS)
    9·2 answers
  • HELPPP LAST ATTEMPT!!
    12·2 answers
  • Miriam is playing a simple game of dice. For every 1 or 6 rolled, Miriam will
    10·1 answer
  • I got a maths equation which i don't really get how to work out, the question is : solve 4x^2+x-3=0
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!