The student came to the conclusion that the system has infinitely many solutions, which is not correct. Describe the error was the student work being shown.

The Student Came To The Conclusion That The System Has Infinitely Many Solutions, Which Is Not Correct.

Answers

Answer 1
The student did not make use of the *other* equation. It is true that a single equation with two variables will have infinite solutions, but two equations with two unknowns, not always!
Answer 2
though the solving for "x" is correct, is only good if the substitution is done no unto itself, because that simply gives it a circular solution which will give that, but is only good if it's used on the other equation.

Related Questions

An angle whose vertex is at the center of a circle is a middle angle of that circle.
A. True
B. False

Answers

B. False 

Because n angle whose vertex is at the center of a circle is a CENTRAL angle of that circle


An angle whose vertex is at the center of a circle is a middle angle of that circle.  

This is false because there can be numerous angles in the center of a circle. Moreover, the angle whose vertex is at the center is called a central angle. The two endpoints of this angle and located at the circumference or outline of the circle and the vertex is located at the center of that circle.

Find an equation for the nth term of the arithmetic sequence.

a15 = -53, a16 = -5

A) an = -725 - 48(n - 1)
B) an = -725 + 48(n + 1)
C) an = -725 + 48(n - 1)
D) an = -725 - 48(n + 1)

Answers

an=a1+d(n-1)

every term increases by d amount

so [tex]a_n+d=a_{n+1}[/tex]
therefor
[tex]a_{15}+d=a_{15+1}=a_{16}[/tex]

-53+d=-5
add 53 both sides
d=48

alright
an=a1+d(n-1)
an=a1+48(n-1)
use a15=-53
a15=-53=a1+48(15-1)
-53=a1+48(14)
-53=a1+672
minus 672 both sides
-725=a1

the equation is
an=-725+48(n-1)
answer is C

Angie baked 100 cookies and 20 brownies. She wants to  split them into equal groups  for the big sale. Each group must have the same number of cookies and brownies, with none left over. What is the greatest number of groups she can make? Angie baked 100 cookies and 20 brownies. She wants to  split them into equal groups  for the big sale. Each group must have the same number of cookies and brownies, with none left over. What is the greatest number of groups she can make? Angie baked 100 cookies and 20 brownies. She wants to  split them into equal groups  for the big sale. Each group must have the same number of cookies and brownies, with none left over. What is the greatest number of groups she can make? 

Answers

stop copying the question, it's confusing

so 100 cookies and 20 brownies
what is the greatest number you can divide them both by?

find the GCF
factor them
100=2*2*5*5
20=2*2*5
so the GCF is the common group to both or 2*2*5 or 20

100/20=5
20/20=1

there are 20 groups, each wit 5 cookies and 1 brownie


20 groups

what is the most efficient first step in the process to factor the trinomial 3x^3-24x^2+36x

Answers

the answer is factor out 3x on apex.

Answer:

Factor out 3x

Step-by-step explanation:

A P E X answer

Find the cost of twelve $1,000 bonds at a quotation of 84.50.

Answers

What we have so far:
*12 bonds
*1 bond = $1,000
*Quotation of 84.50% per bond ($845 each).

What to find:
*QT - Quotation Total. QT = (12 x $1,000) x Quotation
*TC - Total Cost. TC = (12 x $1,000) + QT

Solution:
Finding QT:
QT = (12 x $1,000) x Quotation
QT = (12 x $1,000) x 84.50%
QT = $12,000 x 84.50%
QT = $10,140

Finding TC:
TC = (12 x $1,000) + QT
TC = (12 x $1,000) + $10,140
TC = $12,000 + $10,140
TC = $22,140 <--- What we are looking for.

Therefore, the total cost of twelve $1,000 bonds at a quotation of 84.50% is: $22,140.

David wants to buy a game system and his favorite game.The game costs $25 and is 1/5 of the price of the game system.How much does the game system cost?

Answers

multiply 25 by 5 = 125

 the game system cost 125

 

As per linear equation, the game system costs $125.

What is a linear equation?

"A linear equation is an equation in which the highest power of the variable is always 1."

Given, the cost of the game is $25.

The cost of of the game is [tex]\frac{1}{5}[/tex] of the price of the game system.

Therefore, the cost of the game system is

= 5 × cost of the game

= $(5 × 25)

= $125

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Janet wins the lottery and receives $100 the first year. In the following years, she receives $50 more each year. (That is, Janet receives $150 the second year, $200 the third year, and so on.) How much will Janet receive, in total, after 10 years?

A) $2,500

B) $3,250

C) $1,450

D) $1,500

Answers

The correct answer is B) $3,250, because if you add up the numbers consecutively you get that.

Eric plans to rent a Beach House for a week. He has a coupon for 20% off the daily base rate of $200. He will also have to pay an additional $20 a day for utilities. Which expression represents the situation. (d represents the number of days)

Answers

Answer: 180 d is the required expression.

Step-by-step explanation:

Since,  He has a coupon for 20% off the daily base rate of $200.

Therefore, His daily base cost = 80 % of 200 = [tex]\frac{20\times 80}{100}[/tex] = $ 160

Additional cost he pay in a day = $20

Therefore, his total cost of one day = 160 + 20 = 180

Thus, his total cost in d days = 180 d

Which is the required expression.


Answer:

180d C)

Step-by-step explanation:

40 is 20 percent of 200, if you remove 40 from 200 you get 160. then add 20 and you have 180.

posting a screenshot my loves

Answers

(x-blank)^2 because -14 is negative 

For (x-7)^2, we have -7 because it's -14/7. Next, 7^2=49, so we have to add 49 to the right, getting (x-7)^2+43=49. Subtract 43 from both sides to get
 (x-7)^2=6, and square root both sides to get x-7=sqrt(6) and add 7 to both sides to get x=sqrt(6)+7, which is approximately 9.45. I challenge you to do the next one on your own, using the techniques stated here :)

A video game that costs $30 is on sale for 25% off. What is the sale price?
$37.50
$5
$27.50
$22.50

Answers

If it is on sane for 25% off, that's the same as being on sale for 75% of the original price.

Multiply the original cost by 75% in decimal form.

30*.75=22.5
Final answer: $22.50

There are 325 students in ping pong club. There are 5 girls for every 7 boys in the club. Which is the correct proportion that can be used to determine the number of girls in the club?

Answers

It is 5 to 7 people eliminating A and C automatically. and because it is 5 to 7 and not 7 to 5 it eliminates B too.

Answer: D

Hope this helps :)
Please give brainliest
Final answer:

To find the number of girls in the club, you can set up a proportion using the given information. Cross-multiply the proportion and solve for the number of girls. The approximate number of girls in the club is 232.

Explanation:

To determine the number of girls in the club, we can set up a proportion using the given information. Since there are 5 girls for every 7 boys in the club, the proportion can be written as:

Girls/Boys = 5/7

To find the number of girls, we can solve the proportion by cross-multiplying:

Girls = (5/7) * Total Number of Students

Substituting the given total number of students as 325, we can calculate the number of girls in the club as:

Girls = (5/7) * 325

Girls = 232.14

Therefore, there are approximately 232 girls in the ping pong club.

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what is the smallest positive integer that is divisible by each of the integers from 3 to 7, inclusive

Answers

The integers from 3 to 7, inclusive are:

{3, 4, 5, 6, 7}

these numbers can be written as multiplication of prime factors as :

{3, 2*2, 5, 2*3, 7}

The smallest common multiple of these numbers must have factors which divide all the factors of these 5 numbers.

So the multiple must have these factors: 3, 2*2 (one two is not enough to divide 4), 5 and 7. We do not need to write 2 and three again, because we already have them.

so the smallest common multiple is 3*2*2*5*7=420


Answer: 420

Factor k 2 + 13k + 12.

Answers

Simplifying k2 + -13k + 12 = 0
  Reorder the terms: 12 + -13k + k2 = 0
  Solving 12 + -13k + k2 = 0
  Solving for variable 'k'.
 Factor a trinomial. (1 + -1k)(12 + -1k) = 0

Answer:

The factors of the given polynomial are : (k + 1)(k + 12)

Step-by-step explanation:

The quadratic equation which is needed to be factorized is given as :

k² + 13k + 12

In order to factorize this, arrange 13k in such a way that the product of its factors equals to 12k² ⇒ 13k = 12k + k

⇒ k² + 13k + 12

⇒ k² + k + 12k + 12

⇒ k(k + 1) + 12(k + 1)

⇒ (k + 1)(k + 12)

Hence, The factors of the given polynomial are : (k + 1)(k + 12)

What is the slope of this line y + 3 = -4(x - 5)?

Answers

y+3= -4x+20
y=-4x+17

Final answer: Slope=-4

Just a side note: This is written in point slope form or y-y1= m(x-x1). You could just look at the m value to find slope.

In the figure, the horizontal lines are parallel and AB = BC = CD. If LM = 3 Find JM? A. 12 B. 6 C. 3 D. 9

Answers

 A.12 because i had same question
 

The value of JM is 9, the correct option is D.

What are Parallel Lines?

The lines that always have a constant distance between them and never intersect each other are called Parallel Lines.

The slope of parallel lines is equal to each other.

The parallel lines, AM, BL, CK, DJ can be seen in the figure.

As the distance between AB = BC = CD is equal,

The parallel line runs at same distance from each other and so, the distance between LM= LK = KJ,

The value of LM is 3.

Then the value of JM = LM + KL + KJ

JM = 3 + 3 + 3

JM = 9 units.

Your question seems incomplete, the complete question is attached as an image with the answer.

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Factor x2a2 + 3xa2 + 2a2

Answers

I'm going to assume the equation is x^2 a^2 + 3x a^2 + 2a^2

You factor out the common term, which is a^2.
You would then get a^2(x^2+3x+2) as the answer.
Factor out (x^2+3x+2)

a^2(x+1)(x+2)

What's an equation for "Six more then twice a number is 72?"

Answers

the equation would be:

2x+6 = 72

2n + 6 = 72 <== ur equation

Helppppp! Which answer choice correctly describes the relationship between two of the lines in the figure?

Answers

I would have to say that it is the 3rd answer choice due to the right angle that is formed between line C and line A. 
The correct answer is:  [C]:   " а ⊥ с " .
_____________________________________________________________
Take note of the "right angle" — which indicates that "a" is perpendicular to "c" .
_____________________________________________________________

What is the simplified form of √ 2160x^8/60x^2

Answers

2160 x^8       36 x^6
------------ = 
60 x^2

The correct answer I found is 6x³

what is the surface area of a square pyramid with a base of 12cm and a slanted height of 8cm?

Answers

Base:
12*12= 144 cm^2

Triangle sides:
12*8/2= 48 cm^2 each

Multiply by 4 because there are four of them
48*4= 192 cm^2

Add the base
192+144=336 cm^2

Final answer: 336 cm^2

The graph represents the piecewise function

Answers

left equatoin seems to be x is less than or equal to -1
the slope seems to be 2 and y intercep tis -1 so 2x-1


right equation is x is greater than or equal to 1
slope is 1 and y intercept is 4 so x+4




top left blank is x+4, top right blank is x is greater than or equal to 1
bottom left blank is 2x-1, bottom right blank is x is less than or equal to -1
Answer:

Hence, we have:

        f(x)= 2x-1   when  x ≤ -1

                x+4    when  x ≥ 1

Step-by-step explanation:After looking at the graph we observe that in the region:  x ≤ -1

The graph is a straight line that passes through (-1,-3) and (-2,-5)

Hence, the equation of line is:

[tex]f(x)-(-3)=\dfrac{-5-(-3)}{-2-(-1)}\times (x-(-1))\\\\\\f(x)+3=\dfrac{-5+3}{-2+1}\times (x+1)\\\\\\f(x)+3=2(x+1)\\\\\\f(x)=2x+2-3\\\\\\f(x)=2x-1[/tex]

Also, in the interval  x ≥ 1

The graph is a straight line that passes through (1,5) and (2,6)

Hence, the equation of line is:

 [tex]f(x)-5=\dfrac{6-5}{2-1}\times (x-1)\\\\\\f(x)-5=x-1\\\\\\f(x)=x-1+5\\\\\\f(x)=x+4[/tex]

Which of the following graphs best represents the solution to the pair of equations below? y = −x + 6 y = 2x − 3 A coordinate plane is shown with two lines graphed. One line passes through the y axis at 6 and through the x axis at 6. The other line passes through the y axis at negative 3 and the x axis at 1.5. The lines intersect at the point 3 comma 3. A coordinate plane is shown with two lines graphed. One line passes through the y axis at 6 and the x axis at 6. The other line passes through the y axis at 3 and the x axis at negative 1.5. The lines intersect at 1 comma 5. A coordinate plane is shown with two lines graphed. One line passes through the y axis at 6 and the x axis at negative 6. The other line passes through the y axis at negative 3 and the x axis at negative 1.5. The lines intersect at negative 3 and 3. A coordinate plane is shown with two lines graphed. One line passes through the y axis at 6 and the x axis at negative 6. The other line passes through the y axis at 3 and the x axis at 1.5. The lines intersect at negative 1 comma 5.

Answers

The lines are 

i)  y=-x+6
ii) y=2x-3

The solution of the system of equations is found by equalizing the 2 equations:

-x+6=2x-3

-2x-x=-6-3

-3x=-9

x=-9/(-3)=3

substitute x=3 in either i) or ii):

i)  y=-3+6=3
ii) y=2(3)-3=6-3=3

(the result is the same, so checking one is enough)

This means that the point (3, 3) is a point which is in both lines, so a solution to the system.

In graphs, this means that the lines intersect at (3, 3) ONLY


Answer: The graph where the lines intersect at (3, 3)

The point of intersection of the lines  y = −x + 6 and y = 2x − 3 is (3, 3)

Linear function

A linear function is in the form:

y = mx + b

where y, x are variables, m is the rate of change and b is the y intercept.

Given the equations:

y = −x + 6    (1)

y = 2x − 3      (2)

Solving the equations 1 and 2 simultaneously gives:

x = 3, y = 3

The point of intersection of the lines  y = −x + 6 and y = 2x − 3 is (3, 3)

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Which of the numbers listed below are solutions to the equation? Check all that apply. x2 = -36 A. 6 B. 1296 C. 18.0 D. 72 E. -6 F. None of these

Answers

When x^2 = -36, so -36 equals to x when squared.

So, to find the x square root both terms. But you can't. Why? Because we have a negative number, and you can't do the sqrt of a negative number. So, none of the above is the answer. Non-solvable

staircase of steps in a swimming pool has a vertical rise of 14 inches per step and a landing of 20 inches.

Answers

I think the question for this problem is to find the slope of the staircase. The slope is a ratio of change of the y-coordinates and x-coordinates of points. It is written as Δy/Δx especially in analytical geometry. It could also be simply the ratio of the rise or vertical height to the run or horizontal length.

Therefore, the slope of the stair case is

Slope = rise/run = 14/20 = 0.7

A city’s population, P (in thousands), can be modeled by the equation P = 130( 1.03)^x where x is the number of years after January 1, 2000. For what value of x does the model predict that the population of the city will be approximately 170,000?

Answers

Final answer:

To find the value of x for which the model predicts a population of approximately 170,000, solve the equation P = 130(1.03)^x. Divide both sides by 130, take the logarithm of both sides, and solve for x. The approximate value of x is 9.855.

Explanation:

To find the value of x for which the model predicts a population of approximately 170,000, we need to solve the equation:

170 = 130(1.03)x

To solve for x, we can start by dividing both sides of the equation by 130:

170/130 = (1.03)x

1.3077 = (1.03)x

Next, take the logarithm of both sides of the equation:

log(1.3077) = x * log(1.03)

Using a calculator, we can find that x is approximately 9.855.

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Firstly, we need to clarify that the population given in the question, 170,000, is represented in 'thousands' in the modelling equation. Therefore, for simplicity, it is referred to as '170' in the equation.

We know from the problem that the population model is:

P = 130 * (1.03 ^ x),

where P is the population (in thousands) and x is the number of years since the start point (January 1, 2000). Given that we're looking for the point in time where the population is approximately 170,000 (or '170' in the terms of the equation), we can set P = 170 and solve for x:

170 = 130 * (1.03 ^ x)

Solving an equation in terms of x with an exponent can be handled neatly with logarithms. You can isolate the variable by taking the natural log (ln) of both sides. So we can transform our equation like this:

ln(170 / 130) = ln(1.03 ^ x)

Next, we use the property of logarithms that says the log of a number raised to an exponent is equal to the exponent times the log of the number:

ln(170 / 130) = x * ln(1.03)

Solving for x gives:

x = ln(170 / 130) / ln(1.03)

Calculating the value gives x ≈ 9.075604092564975. However, since the population is generally reported on an annual basis, we round the value of x up to the nearest whole number. That gives us:

x_rounded ≈ 10 years.

So, according to the model, the city's population will reach approximately 170,000 around 10 years after January 1, 2000.

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Help? Sampling

A toy bin has twenty toys in it, five of each type. Storm wants to know which type of toy he would pick if he pulled out one.

Which of the following would be the most appropriate sampling technique?
A. He could use a spinner with four equal-sized sections, one for each toy.

B. He could make a chart to show all of the toys that other people pulled out. <<?

C. He could use a spinner with five equal-sized sections, one for each toy.

D. He could use a random number generator with the total number of toys as the top number.

Answers

Answer:

Option (C) is correct choice.

Explanation:

The most appropriate sampling technique for Storm to determine which type of toy he would pick from the bin is option C. He could use a spinner with five equal-sized sections, one for each type of toy.

Option A (using a spinner with four equal-sized sections) does not accurately represent the distribution of toys in the bin, as there are five types of toys.

Option B (making a chart of toys that other people pulled out) relies on the data from others and does not involve Storm directly selecting a toy.

Option D (using a random number generator) is not as straightforward and intuitive as directly selecting a toy from the bin.

Therefore, option C provides Storm with a fair and simple method to randomly select one type of toy from the bin.

Cylindrical coordinates? Hi,
I am having problems with a homework question,
I am asked to sketch the solid by the given inequalities.
0 <= theta <= pi/2 and r <= z <= 2
How do I find r?
If possible please guide me to the answer instead of giving it to me. I need to know this stuff.
Thanks in advance for any help.

Answers

[tex]0\le\theta\le\dfrac\pi2[/tex] tells you that [tex]x\ge0[/tex] and [tex]y\ge0[/tex].

Recalling that in cylindrical coordinates, [tex]r^2=x^2+y^2\implies r=\sqrt{x^2+y^2}[/tex], we then know that [tex]0\le\sqrt{x^2+y^2}\le z[/tex], and so we're confined to the first octant (where each of [tex]x,y,z[/tex] are non-negative).

The upper limit of [tex]z\le2[/tex] tells us that the region is bounded above by the plane [tex]z=2[/tex], which is parallel to the [tex]x[/tex]-[tex]y[/tex] plane.

Meanwhile, the lower limit of [tex]z=r=\sqrt{x^2+y^2}[/tex] can be visualized by first squaring both sides:

[tex]z=\sqrt{x^2+y^2}\implies z^2=x^2+y^2[/tex]

If you're not already familiar with what this equation represents, we can approach it piecemeal. At one extreme, when [tex]x=y=0[/tex], we have [tex]z=\sqrt{0^2+0^2}=0[/tex], so the region has a "vertex" at the origin.

When [tex]z=2[/tex], we have the Cartesian equation [tex]4=x^2+y^2[/tex], which corresponds to a circle of radius 2. Similarly, if we consider values of [tex]z[/tex] between 0 and 2, we end up with circles of increasing radii. Stacking these circles onto one another, we get a cone.

More specifically, the region is the part of the cone between the [tex]x[/tex]-[tex]y[/tex] plane and the plane [tex]z=2[/tex] restricted to the first octant.

(Image of region attached)

By how much does a^3 - 2a exceed a^2 + a - 6?

Answers

Answer

a³ - a² - 3a + 6


Explanation

The equation requires you to subtract the two expressions.

(a³ - 2a) - (a² + a - 6)

In such an expression we subtract the like term only.

(a³ - 2a) - (a² + a - 6) =  a³ - 2a - a² - a + 6

                                  = a³ - a² -2a - a + 6

                                  = a³ - a² - 3a + 6

The length of a rectangle is twice its width. if the perimeter of the rectangle is 36 cm , find its area.

Answers

L = Length
W = Width

L x W = area
Length = 2w

Lets find the width by solving for w.
2w + w = 36 
3w = 36
3w/3 = 36 / 3 
w = 12

So
L = 2 x 12 = 24
W = 12
L X W = area
24 x 12 = 288 cm^2

Malik solved this system of equations.

2x+4y=24
5x+y=15

As the first step, he decided to solve for in the first equation because it has a small, even number for the coefficient. Jill told him there was a more efficient way. What reason can Jill give for her statement?

A.The variable y in the second equation has a coefficient of one so there will be fewer steps to the solution.
B. The variable x in the second equation has a coefficient of 5 so it will be easy to divide 15 by 5.
C. The variable in the first equation is divisible by 2 so it will be the most efficient way to start.
D. The variable y in the first equation has a larger even number. When dividing by 4, the solution will be a smaller number.

Answers

The variable y in the 2nd equation has a coefficient of 1...so there will be fewer steps to the solution

The variable y in the second equation has a coefficient of one so there will be fewer steps to the solution.

System of equations

Given the simultaneous equation

2x+4y=245x+y=15

The best way to solve this kind of equation is by the substitution method. To do that in an easy way, you can locate which of the variables in the equations has a coefficient of 1.

From equation 2, we can see that the variable "y' has a coefficient of 1, hence the reason that Jill can give for her statement is that the variable y in the second equation has a coefficient of one so there will be fewer steps to the solution.

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