Algebra I

Tell whether the set is closed under the operation. If it is not closed give an example that shows that the set is not closed under the operation.

10. Positive irrational numbers; division
11. Negative rational numbers; multiplication
13. Positive integers; subtraction

1. 👍 0
2. 👎 0
3. 👁 381
1. yes: 12
no: 10,11,13
ā2/ā2 = 1
-2/3 * -3/2 = 1
3-2 = -1

1. 👍 0
2. 👎 0
2. just tell me if ,Under the set of rational numbers is -9 + 12 closed?

1. 👍 0
2. 👎 0

Similar Questions

1. Math

My Answer = **** 1. Write the inequality for the graph. (1 point) image shows closed circle 4 and up. A. x > 4 B. x underscore > 4**** C. x underscore < 4 2. Write the inequality for the graph. image shows open circle up to both

2. Science

One light bulb in a string of lights goes out this causes all other lights in string to go out. This is example of A. Resistor B. parallel circuit C. Closed circuit***** D. Series circuit When a switch is turned from the off to

3. Math

Show that the set of non zero rational numbers is closed under division

4. algebra

consider the following polynomials. ab^2 +3ab+8a^2 and -5ab^2 Use the two polynomials to illustrate the following: a. polynomials are closed under addition. b. polynomials are closed under subtraction. c. polynomials are closed

1. Calculus

The function f is continuous on the closed interval [-5,5], and f(-2) = 6, f(1) = -3, and f(4) = 6. Which of the following statements must be true? A. The equation f(x) = 0 has at least two solutions on the closed interval [-5,5].

2. Math

Decide whether or not the set is closed under addition. {0, 1} A) Closed B) Not closed

4. Physical Science

No system is completely closed off from its surroundings. Which represents a system that is almost completely closed? A. a capped soda bottle B. a wood-burning fireplace C. a washing machine D. a pot of boiling water I believe it

1. English

Which sentence is correct? A. The company closed their offices. B. The company closed its offices. C. The company closed it's offices. D. The company closed there offices. C

2. Language Arts

Read and reread the excerpt from We Shall Not Be Moved. The officers of Local 25 sent them on to the owners ā along with one more demand, recognition of the union. This came to mean the "closed shop." Only union members can work

3. Math

For which operation is the set of integers not closed? A. addition B. subtraction C. multiplication D. division** I'm not sure on this one. Check my answer?

4. Physics

At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 micoF, rmf= 50 V, and R = 10 kļ, what is the potential difference across the resistor as soon as the switch is closed?