Rational numbers are closed under the operations of addition, subtraction and multiplication.

Answers

Answer 1

Rational numbers are indeed closed under the operations of addition, subtraction, and multiplication is true.

We have,

A rational number is any number that can be expressed as a ratio of two integers, where the denominator is not equal to zero.

The set of rational numbers is closed under the operations of addition, subtraction, and multiplication.

This means that if we take any two rational numbers and add them, subtract them, or multiply them together, the result will always be another rational number.

To see why this is true,

Consider two rational numbers a/b and c/d, where a, b, c, and d are integers and b and d are not equal to zero.

To show that rational numbers are closed under addition, we can add the two rational numbers as follows:

a/b + c/d = (ad + bc) / bd

Since a, b, c, and d are all integers, ad + bc is also an integer.

Also, since b and d are not equal to zero, bd is also not equal to zero.

And,

(ad + bc) / bd is a ratio of two integers, where the denominator is not equal to zero.

This means that it is a rational number.

To show that rational numbers are closed under subtraction, we can subtract the two rational numbers as follows:

a/b - c/d = (ad - bc) / bd

Again, since a, b, c, and d are all integers, ad - bc is also an integer, and bd is not equal to zero.

Therefore, (ad - bc) / bd is a rational number.

Finally, to show that rational numbers are closed under multiplication, we can multiply the two rational numbers as follows:

(a/b) x (c/d) = (ac) / (bd)

Once again, ac and bd are integers, and since b and d are not equal to zero, bd is also not equal to zero.

Therefore, (ac) / (bd) is a rational number.

Thus,

Rational numbers are indeed closed under the operations of addition, subtraction, and multiplication.

Learn more about rational numbers here:

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Related Questions

Rhian sat a maths test and an English test. in the maths test, she scored 14/17. in the English test, she scored 31/39. in which test did she do better

Answers

Answer:

She did better on the Math test.

Step-by-step explanation:

14/17 is 82 percent, and 31/19 is only about 80%.

What is 7.0483 rounded to the nearest hundredth?

Answers

Answer:

7.080

Step-by-step explanation:

The rounding off to the number nearest hundredth will be 7.048.

What is rounding off the numbers?

When a number is rounded off, its value is maintained but is brought closer to the next number, simplifying the number. For entire numbers as well as decimals at different places of hundreds, tens, tenths, etc., it is done.

A number can be rounded off to its lower value if the number after the decimal is between 0 and 4. The number will be rounded off to its higher value if the number after it is between 5 and 9.

The given number will be rounded off as below:-

7.0483 = 7.048

Therefore, the rounding off to the number nearest hundredth will be 7.048.

To know more about rounding off numbers follow

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Urgent please help..

Answers

Answer:

72

Step-by-step explanation:

Please help me I will mark you brainliest !!

Answers

Answer:

it would be 5x+2y=10 look at pic for math

What conclusion can you make about
three lengths that do not make a
triangle?

Answers

Step-by-step explanation:

if the 2 shorter sides add up to less than the larger side, then it's not a triangle.

Solve. Use paper to show your work. Enter your answer in the box.



4\frac{5}{6}-2\frac{1}{2}=4
6
5

−2
2
1

=
4
4​

Answers

Answer: illegel input- too many equals signs

Step-by-step explanation:

Expand: logh(9jk) Log Subscript h Baseline 9 times log Subscript h Baseline j times log Subscript h Baseline k Log Subscript h Baseline 9 + log Subscript h Baseline j + log Subscript h Baseline k Log 9 + log j + log k

Answers

Answer:

log h 9 + log h j +log h k

Step-by-step explanation:

i got it right on edg

Answer:

it is B for all u speed run edge people

Step-by-step explanation:

big luck in life

In 50 trials both coins land in a shaded box twice. What is the experimental probability that both coins fall into a shaded box?

Answers

Answer:

1 / 25

Step-by-step explanation:

Number of trials = 50

Number of successes (number of times both coins land in a shaded box) = 2

Experimental probability = (number of successes / number of trials)

Experimental probability (both coins landing into a shaded box) = 2 / 50

= 1 / 25

what are the rules for multiplying negative numbers?​

Answers

Answer:

When multiplying negative numbers, just remember 2 things. 1: 2 negative values will always give a positive value. 2: If you only have 1 negative value, your answer will also be negative. Just remember these rules and the rest is simple multiplication.

Answer:

Hi there! Your answer is down below!

Step-by-step explanation:

The rule of how to multiply negatives is simple: For a case where a negative number is multiplied by a positive, the rule above can be restated as: take the positive number, and the negative WITHOUT the minus sign, multiply them and add the inus sign to the product.

Have a nice day!

What is the scale factor from triangle DEF to triangle ABC?

Answers

Answer:

i think you need to include a picture  

Step-by-step explanation:

Describe how an equation ditt
from an expression.
7. 24 less than the number of snakes is 35.

Answers

Answer:

idek

Step-by-step explanation:

Complete the equations so that the solution of the system of equations is (-3, 5)​

Answers

y=3 x=119292 hope this helps!

Steps for -3(x+2)=4+2x

Answers

Answer:

x = -2

Step-by-step explanation:

-3(x + 2) = 4 + 2x

= -3x + -6 = 4 + 2x  (Distribution: -3)

= -3x + -2x - 6 = 4  (Moving the variables to the left and change the signs)

=  -3x + -2x = 4 + 6 (Move consatnts to the right and change signs)

= -3x - 2x = + 6  --> (Collect like terms)

= -5x = 10 (Then add)

= (divide -5x = 10 by -5)

= x = 2

Identify these foil solutions by using the screenshots below!

Answers

Hope it helps and is correct!

for what values of x and y is PQRS and parallelogram

Answers

Answer:

x = 2

y = 3

Step-by-step explanation:

Measures of opposite sides of a parallelogram are equal.

Therefore,

PQ = SR

2y + 2 = y + 5

2y - y = 5 - 2

y = 3

QR = PS

2x + 3 = y + 4

2x + 3 = 3 + 4 (y = 3)

2x = 7 - 3

2x = 4

x = 4/2

x = 2

Thus, for x = 2 and y = 3, PQRS is a parallelogram.

I need help it's due by 7

Answers

Answer:

Step-by-step explanation:

w=204.8

Answer:

204.8

Step-by-step explanation:

8x25.6=204.8

DOuble Check:

204.8 divided by 25.6=8

Find the tangent of the larger acute angle in a right triangle with side lengths 3, 4, and 5. Write your answer as a fraction

Answers

Answer:

4/3

Step-by-step explanation:

The larger accute angle in a 3 4 5 right triangle will always be the angle in between 3 and 5. Tangent theta = opposite side ÷ adjacent side, so 4/3.

The tangent should be in fraction is [tex]4\div 3[/tex]

Calculation of the tangent:

Since in a right triangle with side lengths 3, 4, and 5

Here there is the larger acute angle in the 3, 4 and 5 so it should be lies between 3 and 5

So, it should be like

= opposite side ÷ adjacent side

= [tex]4\div 3[/tex]

Hence, The tangent should be in fraction is [tex]4\div 3[/tex]

Learn more about fraction here: https://brainly.com/question/19107557

Kayden and his children went into a bakery and will buy donuts and cookies. Each donut costs $1 and each cookie costs $0.75. Kayden has a total of $15 to spend on donuts and cookies. Write an inequality that would represent the possible values for the number of donuts purchased, dd, and the number of cookies purchased, c.c.

Answers

Step-by-step explanation:

1+.75= blank

then subtract 15 and answer above. make sure when you write your final answer to label it. is it chairs, puppies? hope this helps! you got this

find x using the pythagorean theorem

Answers

X= 9.33

Because side x had two intersecting lines that create 90° angles, we can assume that if we cut off the rectangular part of the shape, the other lines would be the same. Now, we are left with the triangular shape. We know that the hypotenuse is 16, but because we got rid of the rectangular part of the shape that had 5 on that side, we have to subtract 18 by 5 to make sure the shape is correct. Now, that side is 13.

Now we solve: 13^2 +x^2=16^2.
169+x^2=256
-169 -169
———————-
X^2=87

Now you square root both sides by 2, getting X= 9.33

para que sirve el álgebra​

Answers

Answer:

si mamacita

Step-by-step explanation:

El álgebra es un tipo de matemática. Se trata de ecuaciones y resolución de incógnitas. El álgebra se usa para calcular números basados ​​en una ecuación. ¡Espero que esto ayude!

y=x/3+2.
Its a benchmark pls help

Answers

Answer:

Slope:

y= 1/3

Solve 5x=45 using the opposite operation

Answers

Answer:

the answer is 8

Step-by-step explanation:

5 times  8 =45 5 time table

Answer:

9

Step-by-step explanation:

8x9=45

The formula A-lw is used to calculate the area A of a rectangular surface using the length and the width
(w) of the surface. Which formula could be used to find w in terms of A and I?

Answers

The area of a rectangle is the product of the two sides. One side is the height of the can, the other side is the perimeter of the circle, since the label wraps once around the can. So the area of the rectangle is (2 pi r)* h.


Use Inverse trig functions to solve for the missing angles
D
8.5
F
E
6.5

Answers

Answer:

Angle <E is approximately 40 degrees, and angle <D is approximately 50 degrees

Step-by-step explanation:

Since angle <F is clearly 90 degrees, we can find angle E using the cosine function that relates the adjacent side to the angle with the hypotenuse:

[tex]cos(\theta)=\frac{adj}{hyp} \\cos(E)=\frac{6.5}{8.5}\\E = arccos(\frac{6.5}{8.5})\\E\approx 40.12^o[/tex]

And we use the sin function to deal with angle <D:

[tex]sin(\theta)=\frac{opp}{hyp} \\sin(D)=\frac{6.5}{8.5}\\D = arcsin(\frac{6.5}{8.5})\\D\approx 50^o[/tex]

PLEASE HELP! Due in a few hours!!
You need to workout the area of the shape :)

Answers

Answer:

breakdown the initial figure into 2 rectangle

and add their area

A wooden box has the shape of a rectangular prism. The inside of the box is also a rectangular prism. What is the volume of the solid part of the box? Enter your answer below.

Answers

Answer:

1242

Step-by-step explanation:

Line segment JK has endpoints at J(-3,4) and K(3,6). Which is an equation of a line that is perpendicular to line segment JK and passes through the point (3,-12)

Answers

Answer:

y = -3x - 3.

Step-by-step explanation:

Find the slope of the line JK:

Slope = (6-4)/(3- (-3))

= 2 / 6

= 1/3.

Therefore the slope of the line perpendicular to it is - 1 / 1/3

= -3.

Now we use the point-slope form of a line to get the required equation:

y - y1 = m(x - x1)

Here m = -3 and (x1, y1) = (3, -12) so we have

y - (-12) = -3(x - 3)

y + 12 = -3x + 9

y = -3x + 9 - 12

y = -3x - 3 is the answer.

Select all that apply.

Chandler can mow 2 lawns per hour. If L represents lawns and H represents hours, which of the following equations represent this rate relationship?
L = 2 × H
H = × L
H = 2 × L
L = × H

Answers

Answer:

L = 2 × H

Step-by-step explanation:

The amount of lawns mowed would equal 2 times how many hours because he can mow 2 lawns in a hour.

Answer:

mark other guy brainliest pls. good answer guy above my head

Step-by-step explanation:

Se sabe q la suma de tres numeros es de 850. El primer es un tercio del segundo y el tercer número es el doble del segundo.¿Cuales son los numeros apollese en el esquema de barra para solucionar el problema?

Answers

Answer:

Primer número = x = 85

Segundo número = y = 255

Tercer número = z = 510

Step-by-step explanation:

Se sabe que la suma de tres números es 850. El primero es un tercio del segundo y el tercer número es el doble del segundo.

Representamos:

Primer número = x

Segundo número = y

Tercer número = z

Se sabe que la suma de tres números es 850.

x + y + z = 850 ...... Ecuación 1

El primero es un tercio del segundo

x = 1/3 años

El tercer número es el doble del segundo.

z = 2 años

Sustituimos 1 / 3y por x y 2y por z en la Ecuación 1

1 / 3y + y + 2y = 850

y / 3 + 3y = 850

Multiplica ambos lados por 3

y + 9y = 850 × 3

10 años = 2550

y = 2550/10

y = 255

Resolviendo para x

x = 1/3 años

x = 1/3 × 255

x = 85

z = 2 años

z = 2 × 255

z = 510

Por eso,

Primer número = x = 85

Segundo número = y = 255

Tercer número = z = 510

can someone please help me, i have to turn this in soon.​

Answers

B is the correct answerPlease let me know if I am wrong.
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