Answer:
3+5y+3x-(26-3)
De las 30 preguntas del examen de matematicas, por cada respuesta correcta se obtenian 5 puntos y por cada respuesta incorrecta, o pregunta no contestada,se perdian 2 puntos teodolindo obtuvo 94 puntos en este examen ¿cuantas respuestas correctas tuvo?
Answer:
Teodolindo obtuvo 22 respuestas correctas y 8 respuestas incorrectas o no contestadas.
Step-by-step explanation:
Un sistema de ecuaciones lineales, también conocido como sistema lineal de ecuaciones o simplemente sistema lineal, es un conjunto de ecuaciones lineales (es decir, un sistema de ecuaciones en donde cada ecuación es de primer grado), en el cual se relacionan dos o más incógnitas.
En los sistemas de ecuaciones, se debe buscar los valores de las incógnitas, con los cuales al reemplazar, deben dar la solución planteada en ambas ecuaciones.
En este caso se debe establecer un sistema de ecuaciones, donde las variables son:
x: cantidad de respuestas correctasy: cantidad de respuestas incorrectas o no contestadasSiendo 30 preguntas en el examen, se tiene la ecuación:
x + y= 30
Por cada respuesta correcta se obtenían 5 puntos y por cada respuesta incorrecta o pregunta no contestada, se perdían 2 puntos. Teodolindo obtuvo 94 puntos en este examen. Entonces se representa esta situación mediante la expresión:
5*x - 2*y= 94
Entonces el sistema de ecuaciones a resolver es:
[tex]\left \{ {{x+y=30} \atop {5*x-2*y=94}} \right.[/tex]
El método de sustitución consiste en despejar o aislar una de las incógnitas (por ejemplo, x ) y sustituir su expresión en la otra ecuación. De este modo, obtienes una ecuación de primer grado con la otra incógnita, y . Una vez resuelta, calculas el valor de x sustituyendo el valor de y calculado.
Entonces, despejando el valor de x de la primer expresión obtienes:
x= 30 -y
Reemplazando en la segunda ecuación obtienes:
5*(30 -y) - 2*y= 94
Resolviendo:
5*30 - 5*y - 2*y= 94
150 - 5*y - 2*y= 94
- 5*y - 2*y= 94 -150
-7*y= -56
y= (-56)÷(-7)
y= 8
Reemplazando el valor de y obtenido en la expresión x= 30 -y se obtiene:
x= 30 - 8
x=22
Teodolindo obtuvo 22 respuestas correctas y 8 respuestas incorrectas o no contestadas.
Dion predicted that he would sell 87 art prints. He actually sold 100 art prints. What are the values of a and b in the table below?
Percent Error
Item
Approximate value
Exact value
Error
Absolute error
Ratio
Percent error
Art prints
87
100
a
b
a = negative 13; b = negative 13
a = negative 13; b = 13
a = 13; b = negative 13
a = 13; b = 13
Answer:
A
Step-by-step explanation:
Answer:
a
Step-by-step explanation:
PLZZ HELPPPP QUIICKK :))
Answer:
A...................
Nicole is cooking cookies recipe calls for 5 cups of flour she has already put in three 1/3 cups how many more cups does she need to put in
Answer:
1 2/3 cups of flour
Step-by-step explanation:
Nicole is cooking cookies recipe calls for 5 cups of flour she has already put in three 1/3 cups how many more cups does she need to put in?
We solve the above question using Subtraction operation
The number of cups she still needs to put in =
5 cups - 3 1/3 cups
= 5 - 3 1/3
= 5/1 - 10/3
The Lowest Common Denominator = 3
= 15 - 10/3
= 5/3
= 1 2/3 cups of flour
Rectangular field that measure 2 feet by 18 inches
Answer:
432 square inches
Step-by-step explanation:
thats the area, perimiter is 84 inches
Answer:
Area: 24*18= 432 inches squared
Perimeter: 18+18+24+24= 84 inches
Step-by-step explanation:
2 feet can also be 24 inches
question is in the picture :) please help I missed the lesson and my teacher isnt any help :/
Answer:
x = 23
Step-by-step explanation:
This entire angle makes up 90° b/c of the square box
65 + x + 2 = 90
x + 67 = 90
x = 23
Answer: x=23
Step-by-step explanation:
This is a right angle. A right angle is 90°. It already gives us 65°. So 90-65=25°. We now know (x+2) ° = 25°. 25-2=23.
We can prove this is correct by answering the problem they gave us. (23+2) is 25. 25+65=90° 90° is a right triangle which also happens to be the triangle they have shown us.
HELP HELP HELP HELP HELP!
Distribute the following expression, and type the equivalent expression into the text box.
3(12x-6)
Answer: thanks for brainly points kid
Step-by-step explanation:
What’s 16.001 to the nearest one? help me pleaseee
Answer:
16
Step-by-step explanation:
I think you're referring to the nearest whole number, which should be 16 because that's after the decimal point
A phone company charges for service according to the formula: C(n) = 27 + 0.03n, where n is the number of min talked, and C(n) is the monthly charge, in dollars.
The rate of change in this equation is:
The initial value in this equation is:
Answer:
0.03
27
Step-by-step explanation:
Use the formula y=mx+b
m= slope
b= y-int
Rate of change can also be interpreted as the slope.
0.03
The initial value can be interpreted as the y-intercept.
27
A tree is 40 feet tall.
A basketball hoop is 10 feet tall.
What is the difference in height between the tree
and the basketball hoop?
What is the difference in height between the
basketball hoop and the tree?
What is the distance between the heights of the
tree and the basketball hoop?
What is the distance between the heights of the
tree and the basketball hoop?
Answer:
1. 30
Step-by-step explanation:
40-10=30
Answer:
b its b
Step-by-step explanation:
||
o34
38
o33
оз10
Y’all what this is ?
Answer:
i think its the 3rd one im sorry if im wrong
Step-by-step explanation:
An online games club charges $5.75 for the first game download and $2 for each additional
download per month. Write a rule for describing the total monthly fees f as a function of
additional downloaus d. What are the fees for 15 game downloads in a month?
Answer:
a) The rule is;
f = 5.75 + 2d
b) f = $33.75
Step-by-step explanation:
Here, we want to write a rule
The rule is that we have a standard download fee of 5.75 for the first download, and then a download fee of $2 per download for the rest
We have this as;
f = 5.75 + 2(d)
f = 2d + 5.75
Now for 15 downloads;
first download is $5.75, remaking 14 is at a rate of $2 per one
Thus, we have the fee value as;
f = 5.75 + 2(14)
f = 5.75 + 28 = $33.75
I need help please, If triangle JKL is congruent to QRS, find each missing value
Answer:
x = 5, y = 17, z = 8
Step-by-step explanation:
Since the triangles are congruent to each other, corresponding angles and sides are congruent to each other.
JL corresponds with QS so...
3x - 1 = 14
3x = 15
x = 5
RS corresponds with LK so...
y + 10 = 27
y = 17
Angle L corresponds with angle S so...
180 - 58 - 87 = 4z + 3
35 = 4z + 3
32 = 4z
z = 8
Is the answer one solution, infinite solutions or no solution?
Answer:
infinite
Step-by-step explanation:
after distributing:
56x-40 = 56x-40
if both sides are equal then there are infinite values of 'x' that will make the equation true
Answer:
Step-by-step explanation:
infinite solutions
(−∞,∞)
Ian and Rachel each made a trail mix. The amounts of ingredients they have are shown. Ian used all of the coconut, dried cranberries, and dried bananas to make his trail mix. Rachel made 2 cups of trail mix containing all of the almonds, pumpkin seeds, and granola. How much trail mix did Ian make? How much more trail mix did Rachel make than Ian? Trail Mix Ingredients 4 cup almonds 4 cup pumpkin seeds 4cup coconut 4cup dried cranberries 1 4cup walnuts 1 cup granola4cup dried bananas
Answer:
The values written as Trail mix ingredients is not well written below is the trail mix ingredients
answer :
i) Ian made : 1 3/4 cups of trail mix
ii) Racheal made 1/4 more cup of trail mix
Step-by-step explanation:
Given that :
Trail Mix Ingredients
3 /4 cup almonds
1 /4 cup pumpkin seeds
2 /4 cup coconut
3 /4 cup dried cranberries
1 2 /4 cup walnuts
1 cup granola
2 /4 cup dried bananas
i) Ian used all of coconut , dried cranberries and dried Bananas
= 2/4 + 3/4 + 2/4
Amount of trail mix made = 7/4 = 1 3/4 cups
ii) Racheal made 2 cups of trail mix containing ; all almonds , pumpkin seeds and granola
= 3/4 + 1/4 + 1 = 2 cups of trail mix
Hence Racheal made ( 2 - 1 3/4 ) more trail mix than Ian
= 1/4 more cup of trail mix was made by Racheal
Solve the system by substitution.
Y=3/4x-3
Y=1/4x+1
Answer must be in (y,x) or something like that
Will mark brainliest if correct.
pls send this answer pls pls pls
no fake answer pls pls
Answer:
6.75×10^5
Step-by-step explanation:
that's the answerrr
Answer:
6.75x10^5
Step-by-step explanation:
A popular band wants to sell $84,000,000 worth of tickets on its upcoming tour. If each ticket
costs $28, how many tickets will the band have to sell to meet its goal?
tickets
Answer:
3000000 is needed to meet the goal $84,000,00
Step-by-step explanation:
Divide 84,000,000 by 28
84000000/28
= 3000000
Please Help Quick ASAP Hurry
Figure ABCD is a parallelogram.Which statement must be true?
a. AB is congruent to BC
b. AB is parallel to BC
c. AD is parallel to BC
d. \ is congruent to \C
Answer:
Step-by-step explanation:
Answer:
a. AB is congruent to BC Not True
b. AB is parallel to BC Not True
c. AD is parallel to BC True
d. \ is congruent to \C Not True
Step-by-step explanation:
An inspector of school have wishes to distribute 84 balls and 180 bats equally among the number of boys . Find the greatest number recieving the gift in this way
Answer:
12 boys
Step-by-step explanation:
Given that:
Number of balls to be distributed = 84
Number of bats to be distributed = 180
To obtain the greatest number of boys receiving these items ; obtain the Highest common factor of both numbers ;
84 : 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84.
180 : 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, and 180
The highest common factor here is 12, hence the greatest number of boys receiving the gifts is 12.
Help plz 20 points do all work
Answer:
1.7x+1y
2.9x+8n
3.-1r-4n+9y
4.17y-9x
5.-9n-r
Step-by-step explanation:
Combine Like Terms!
Hope this helps! :)
Answer:
1. 8x + 3y - x - 2y
= 8x - x + 3y - 2y
= 7x + y
2. 3n - 7n - 2n + x + 8x
= 3n - 9n + 9x
= - 6n + 9x
3. 2r - 5n + 9y - 3r + n
= 2r - 3r - 5n + n + 9y
= -r - 4n + 9y
4. 12y - 6x + 5y - 3n
= 12y + 5y - 6x - 3n
= 17y - 9n
5. - 13n + 4n - r
= -9n - r
6. 7xy - 8x + 6xy - y
= 7xy + 6xy - 8x - y
= 13xy - 8x - y
7. - 14r - 10n - 3r - 9n
= -14r - 3r - 10n - 9n
= - 17r - 19n
8. 6r + 9r - 2r - 13n
= 6r + 7r - 13n
= 13r - 13n
9. n + r + x - 3x +4r
= n + r + 4r + x - 3x
= n + 5r - 2x
10. 15y - 7x + 9z + 4z - 3x
= 15y - 7x - 3x + 9z + 4z
= 15y - 10x + 13z
Step-by-step explanation:
You just have to group like terms and then 'add' or 'subtract'.
if a parallelogram is 1.9ft at its base and 1.5 at its height what's its area?
Answer:
2.85 ft²
Step-by-step explanation:
1.9 x 1.5
Help me please , due soon
Answer:
Radius=12cm
Diameter=24cm
Step-by-step explanation:
The diameter is the full length of the circle through the middle (which is shown in the picture as 24cm).
The radius is half of the diameter.
Answer:
radius is 12 cm
diameter 24 cm
Graph the equation
y = -3. Determine the
slope of the line
Answer:
The slope is 0
Step-by-step explanation:
The line is horizontal. All horizontal lines have a slope of 0.
The graph is attached.
The endpoints of a line segment are (–1, 6) and (8, 6). What is the length of the line segment?
A.
2 units
B.
7 units
C.
9 units
D.
12 units
The regualar price of a pair of sneackers
is $55 they are on sale for 25%
Answer:
$41 is your answer
Hope it Helps :)
Answer:
$41.25
Step-by-step explanation:
If the shoes regular price was $55 and the shoes are having a sale for 25%, this is how you would do the math.
25% is 25/100 or .25
55 * .25 = $13.75
55 - 13.75 = 41.25
In ΔMNO, the measure of ∠O=90°, the measure of ∠M=11°, and NO = 80 feet. Find the length of OM to the nearest tenth of a foot. Please show work.
Answer:
OM = 411.56 ft
Step-by-step explanation:
tan 11 = 80/x
0.1944 = 80/x
x = 411.56 ft
24. Jeremiah is building a fence around his swimming pool 25 yards long
using standard fencing that is 48 inches high. What additional information
is necessary to determine the number of fence posts he will need?
A) The length of each post
B) The distance between posts
C) How deep the posts will be set
OD) The number of feet in a roll of fencing
Find the x- and y-intercepts of the graph of 4x + 4y = 20. State your answers as
whole numbers or as improper fractions in simplest form.
Answer: x-intercepts = (5,0)
y-intercepts = (0,5)
Step-by-step explanation:
Plug y=0 into the equation and solve the resulting equation 4x=20 for x
Plug x=0 into the equation and solve the resulting equation 4y=20 for y
Which of the following angle relationships in △ABC are correct? Select all that apply. There is a triangle ABC in which the length of side AB is 3.1, the length of side BC is 3, and the length of side AC is 2.9.
A. m∠A < m∠C B. m∠B = m∠C C. m∠A < m∠B D. m∠B < m∠A < m∠C
9514 1404 393
Answer:
A, B, D
Step-by-step explanation:
The sides in order from smallest to largest are ...
AC, BC, AB
Then the opposite angles in order from smallest to largest are ...
B, A, C
Let's consider the choices:
A. m∠A < m∠C --- true
B. m∠B = m∠C --- true
C. m∠A < m∠B --- false
D. m∠B < m∠A < m∠C --- true