Mathematics High School


Which of the following is an example of why irrational numbers are 'not' closed under addition?

√4 + √4 = 2 + 2 = 4, and 4 is not irrantonal
1/2 + 1/2 = 1, and 1 is not irrational
√10 + (-√10) = 0, and 0 is not irrational
-3 + 3 = 0, and 0 is not irrational

Answers

Answer 1
To show that irrational numbers are not closed under addition we need to find 2 irrational numbers which sum gives us NON irrational number (rational number)

First option isn't true because we have to start with irrational numbers and √4 = 2 is rational number.

second option also isnt true because again we have to start with irrational numbers and we are starting with 1/2 which is rational.

Third one is true

√10 and -√10 are 2 irrational numbers which some is 0 which is rational.

last one isn't true because of same reason as 1 and 2 options.

Answer is third option.

Answer 2

Answer:

Step-by-step explanation:

its answer C !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Related Questions

What is the multiplicative rate of change for the exponential function f(x) = 2(5/2)–x(to the negative X)?
A.0.4
B.0.6
C.1.5
D.2.5

Answers

We have to find the multiplicative rate of change for:
f ( x ) = 2 * ( 5/2 ) ^(-x)
[tex]f ( x ) = 2* (\frac{5}{2}) ^{-x} = 2 * ( \frac{2}{5}) ^{x} [/tex]
2 / 5 = 0.4
Answer:
A ) 0.4

Answer:

A. 0.4

Step-by-step explanation:

HELLPP MEE PLEAASSEEE!!????
Is ABC DEF?
If so, name the postulate that applies.

A. congruent - SAS
B. congruent - ASA
C. congruent - SSS
D. might not be congruent

Answers

They are congruent by SAS

Benny has saved 42 quarters from washing cars how many cents does Benny have

Answers

We Know, 1 quarter = 25 cents
Then, 42 quarter = 25 * 42  = 1050 cents

So, he saved 1050 cents

Hope this helps!
Um, well if you do 42 x.25 =10.50$. So 1050¢ Hope this helps!

.
Which of the following is the correctly abbreviated SI unit describing the amount of a substance?




M



kg



mol



g

Answers

the amount of substance unit is mol, the answer is c

AB is tangent to O. If AO = 24 and BC = 27, what is AB?

Choices:
45
69
54
51

Answers

24^2+x^2 = 51^2 576+x^2 = 2601 x^2 = 2601-576 x^2 = 2025 x = sqrt(2025) x = 45 So AB = 45
so its A hope this helps...

The measure of the side AB will be 45. The correct option is A.

What is the Pythagorean theorem?

Pythagorean theorem states that in the right angle triangle, the hypotenuse square is equal to the square of the sum of the other two sides. According to this statement, the areas of the squares on the other two sides add up to the size of the square whose side is the hypotenuse.

Use the Pythagorean theorem to calculate the length of AB as below,

OB² = AB² + OA²

(BC + OC)² = AB² + OA²

(27 + 24)² =  AB² + 24²

AB² = 51² - 24²

AB = 45 units

Therefore, the correct option is A. The value of length AB is 45.

To know more about the Pythagorean theorem follow

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Devil has 39 toy blocks what is the value of the digit nine in this number

Answers

its the unit 

hope this helps you

$9.00 for 3 pairs of socks

Answers

Sounds like your paying 3 dollars for each pair of socks. 

Which number sentence should be used to solve this problem? Ethan collected 30.4 pounds of recycling in June. He collected 35.5 pounds in July.

How many more pounds of recycling did Ethan collect in July than June?

A.
30.4 + 35.5 = ?

B.
35.5 - 30.4 = ?

C.
30.4 - 35.5 = ?

D.
35.5 + 30.4 = ?

Answers

The answer is B. 35.5 - 30.4=5.1

He collected with 5.1 more pounds in July than in June

If total Revenue is $3000, Cost of Goods is $1500, and total Selling Expense is $500; what is the Profit for the business?

Answers

I would like to see the multiple questions, but i'll try to help.Total Revenue $3000. Cost of goods is $1500. And total selling is $500. What is the profit. $3000 + $ 1500 =$4,500 - $500 = $4,000 Profit. I hope this is correct.
Profit= Total Revenue- Cost of goods- operating expense so the total Profit is $1,000

what is the product of 3x4 y2 and 2xy3?

Answers

3x[tex] 3x^{4} y^{2} (2x y^{3} )[/tex]
[tex] 6x^{5} y^{5} [/tex]
When multiplying, power is added. When divide, it is subtracted.
The for answer of this product is
[tex] 6x^{5} y^{5} [/tex]

eremy is working at 2 jobs to save money for his college education. He makes $8 per hours working for his uncle at Pizza Pie busing tables and $10 per hour tutoring peers after school in math. His goal is to make $160 per week. Part c- After researching the costs of colleges, Jeremy decides he needs to make more than $160 each week. Write an inequality in two variables to represent the amount of money Jeremy needs to make. Then graph.

Answers

If "p" is the number of hours Jeremy works at Pizza Pie, then 8p is the number of dollars he makes from Pizza Pie. In the same way, if "m" is the number of hours he spends tutoring math, then 10m is the amount of money he makes from tutoring math. Together, he makes 8p + 10m dollars each week. But Jeremy needs that amount of money to be MORE than $160. So that becomes the inequality... 8p + 10m > 160 You can graph it by using "m" as one axis and "p" as the other.

Final answer:

Jeremy needs to create an inequality to represent his new earning goal higher than $160 a week, leading to the inequality 8x + 10y > 160. This can be graphed by first converting to intercept form, plotting the intercept and slope, drawing a dashed boundary line, and shading the region above this line.

Explanation:

Jeremy is working two jobs to save for his college education and needs to create an inequality to represent the amount he needs to make each week, now more than $160. Let's denote the number of hours Jeremy works busing tables as x and the number of hours he spends tutoring as y. He makes $8 per hour busing tables and $10 per hour tutoring.

To express Jeremy's goal of making more than $160 a week, we can write the following inequality:

8x + 10y > 160

To graph this inequality:

First, rewrite the inequality as y > (-4/5)x + 16 to get the intercept form.

Plot the y-intercept at (0, 16) on the graph.

Use the slope of -4/5 to determine another point. From (0, 16), move 5 units to the right (positive x-direction) and 4 units down (negative y-direction), then plot this second point.

Draw a dashed line through the two points to represent the boundary of the inequality (dashed because the inequality is strict and does not include the line itself).

Shade above the line to indicate that all solutions to the inequality lie in this area, where Jeremy would be earning more than $160.

whats the anserr becuse i got this wrong on a home work sheet

Answers

Well to demonstrate the answer, let's look at a basic example:

Sq root of 2^2 = ?
Well 2 ^2 = 2•2 = 4 and the square root of 4 is 2. So whenever you think of what the opposite of squaring or raising something to the value of 2, the reverse would be taking the square root of the number or expression.

So sq root of 14x • sq. root of 14x = (sq. root of 14x) ^2 which is simply 14x.

The solution is 14x.

Express this amount in dozens. (Use decimal form.) 7.5 cupcakes
...?

Answers

0.625 dozen

1/12 x 7.5
= 0.625

The reflecting dish of a parabolic microphone has a cross-section in the shape of a parabola. The microphone itself is placed on the focus of the parabola. If the parabola is 60 inches wide and 30 inches deep, how far from the vertex should the microphone be placed?

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
If we set the vertex at (0,0) then the curve goes through (30,30) 

y = 1/30 x^2 
x^2 = 30y 

Since the parabola x^2 = 4py has its focus at y=p, 4p=30 and the mic should be 15/2 inches up from the vertex.

solve the equation for y 2x+6y=13

Answers

I hope this helps you



6y=13-2x


y=13-2x/6


y=13/6-1/3x
So here is how we are going to solve for y for the given equation above:
2x+6y=13
Next, transfer 2x to the right side and it will look like this:
6y=13-2x
Now, divide both sides by 6, and it will look like this:
y=13-2x
    --------
       6
So, this is the final answer for y.
Hope this answers your question. Have a great day!

If a 100(degree) arc of a circle has a length of 8 inches, to the nearest inch, what is the radius of the circle?

Answers

 100(degree) arc of a circle has a length og 8 inches what is og



Choose what the expressions below best represent within the context of the word problem.

The length of a rectangle is 12 inches more than its width. What is the width of the rectangle if the perimeter is 42 inches?

x best represents .

x + 12 best represents .

Answers

I hope this helps you
The question is what both experssions best represent in the context of the problem.

The expresssion x best represents the width of the rectangle.

The expression x + 12 best reprents the lenght of the rectangle.

This is because if you call x the width, then the length is 12 more than that, i.e. 12 + x.

If you wanted to solve the problem now you could write

2*(width + length) = perimeter

2(x + 12 + x) = 24 and solve for x.

But the answer to the question is:

x best represents the width of the rectangle.

x + 12 best reprents the lenght of the rectangle.


triangle PQR is similar to Triangle TUV. the perimeter of triangle PQR is 60 inches. what is the perimeter of triangle TUV?

Answers

I'm assuming you don't know the definition of similarity, which is fine, but I want to clarify just in case you don't: Similarity is when two figures are the same in angles ONLY, and their sizes are proportional. Given this, PQR has a side 20" and TUV's respective side is 6". Now, there's a ratio: 20:6 Now, would you agree that it would then be logical that the perimeter would follow the same ratio? Where 60:P(TUV)? Hope this helps some!

A group of 483 students is taking a field trip. one bus is needed for every 50 students. how many buses are needed?

Answers

The students will need to take 9 buses for the field trip.

Deshaun went for a drive in his new car. He drove at a speed of 62 miles per hour for 99.2 miles. For how many hours did he drive?

Answers

62/1  99.2/x 
99.2/62 = x
The answer is 1.6 hours.

Deshaun drove at a speed of 62 miles per hour for 99.2 miles. To calculate the time spent driving, use the formula Time = Distance / Speed. The time taken for his drive is approximately 1.6 hours.

The question pertains to calculating the driving time given the speed and distance traveled by Deshaun in his new car. He drove at a speed of 62 miles per hour for 99.2 miles. To find out how many hours he drove, we use the formula for time which is:

Time (t) = Distance (d) / Speed (v)

Here, the distance d is 99.2 miles and the speed v is 62 miles per hour.

So we calculate the time t as follows:

t = 99.2 miles / 62 miles per hour

The time taken by Deshaun for his drive is approximately 1.6 hours.

Suppose the first term of a geometric sequence is multiplied by a nonzero constant, c. What happens to the following terms in the sequence? What happens to the sum of this geometric sequence? (This question has one right answer.) Give an example of a geometric sequence to illustrate your reasoning. (Many answers are possible.)

Answers

the next  terms in the sequence will be multiplied by c, but the common ratio is still the same

example :

S = [1(3)^4 - 1]/ [3-1]  = 80/2 - 40

Hope this helps

A test for the presence of a certain disease has probability 0.2 of giving a false-positive result (indicating that an individual has the disease when this is not the case) and probability 0.1 of giving a false-negative result. Suppose that 10 individuals are tested, 5 of whom have the disease and 5 whom do not. Let X be the number of positive readings that result.

a. Explain why X does not have a binomial distribution.

b. Find the probability that exactly 3 of the 10 test results is positive?

Answers

For the part b of the question please find the attached image.

Which of the following are true statements?

Check all that apply.

A. The graph of ƒ(x)=-1/2√x will look like the graph of ƒ(x)=√x but will reflect it about the x-axis and shrink it vertically by a factor of 1/2.
B. The graph of ƒ(x)=-1/2√x will look like the graph of ƒ(x)=√x but will shrink it horizontally by a factor of 1/2.
C. ƒ(x)=-1/2√x has the same domain but a different range as ƒ(x)=√x.
D. The graph of ƒ(x)=-1/2√x will look like the graph of ƒ(x)=√x but will shrink it vertically by a factor of 1/2.
...?

Answers

Answer:

A

C

Step-by-step explanation:

Here we must compare a function and its transformation, we will see that the correct options are A and C.

First, we must define the transformations that we will be using here.

Reflection about the x-axis:

For a function f(x) a reflection about the x-axis is written as:

g(x) = -f(x)

Vertical contraction.

For a function f(x) a vertical contraction of scale factor k is written as:

g(x) = k*f(x)

So here we start with:

ƒ(x)=√x

Then we reflect it about the x-axis to get:

ƒ(x)=-√x

Then we shrink it by a scale factor k = 1/2

ƒ(x) = (-1/2)*√x

From this, we can see that the correct options are:

A. The graph of ƒ(x)=-1/2√x will look like the graph of ƒ(x)=√x but will reflect it about the x-axis and shrink it vertically by a factor of 1/2.

And C is also true, because we have a reflection about the x-axis, the range changed from positive values to negative values, so:

C. ƒ(x)=-1/2√x has the same domain but a different range as ƒ(x)=√x.

Is also a correct option.

If you want to learn more, you can read:

https://brainly.com/question/14536884

A boat, whose speed in still water is 1.96 m/s, must cross a W = 217 m wide river and arrive at a point D = 111 m upstream from where it starts, as shown in figure below.


To do so, the pilot must head the boat at a 42.9° upstream angle. What is the speed of the river's current?

Answers

if u resolve the inital velocity then u will get the vertical component to be 1.96*cos 42.9 = 0.732 * 1.96=1.434 m / s time taken to cross = 217 / 1.434=151.32seconds distance travelled in x direction = 111m initial velocity in x direction = - 1.96 * sin 42.9 = = -0.680 *1.96= - 1.33 disance = speed * time d = (v of current + velocity of man) * time 111= (v - 1.33)* 151.32 v - 1.33 = 0.733 v= 1.33 + 0.73 = 2.063

how do I solve : CSC pi/6 ...?

Answers

csc x = 1 / sin x
sin π / 6 = sin 30° = 1/2
csc π/6 = 1/ sin π/6 = 1 / sin 30° = 1 : 1/2 = 2
Answer:
csc π/6 = 2

What describes each face on a dodecahedron?


A. equilateral triangle B. equilateral pentagon C. circle D. square ...?

Answers

The correct answer for this question would be option B. EQUILATERAL PENTAGON is the description of each face on a dodecahedron. A dodecahedron is also known as a pentagonal dodecahedron and it is composed of twelve regular pentagonal faces. It is also one of the five Platonic solids. Hope this answer helps. 

what is the GCF of 9, 27,and 63

Answers

The answer is 3.
3×3=9
3×9=27
3×21=63
The factors of 9 are 1,  3,  and 9 .

The factors of 27 are 1,  3,  9,  and 27 .

The factors of 63 are 1,  3,  7,  9,  21,  and 63 .

The common factors of 9, 27, and 63 are 1,  3,  and 9.

Their greatest common factor is  9  .

A student reads 3/5 of a book in 30 minutes. if the student is reading at the same speed in 40 minute how much of the book will the student read

Answers

He will read 4/5 of the book in 40 minutes

what is the highest common factor of 630 and 1560

Answers

The highest common factor of 630 and 1560 is 30.

630, 1560 | 10
63, 156 | 3
21, 52

Now you multiply 10 by 3 and you get 30. Thirty is the highest number that you can use to divide these two numbers.

A table factor of .7312 from a present value table of $1 means that a certain rate of interest for a certain period of time it will equal? ...?

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

Below are the choices that can be found elsewhere:

Never equal
Over $1
None of these
Less than $1
$1

The answer should be Less than $1
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