If A = {positive even integers} and B = {positive odd integers}, what is A union B?

{positive integers}

{integers}

{0}

{ }

Question 31 (Multiple Choice Worth 2 points)

[2.02] Solve for x: -3(x - 3) = 21

x = -10

x = 10

x = -4

x = 4

Question

If A = {positive even integers} and B = {positive odd integers}, what is A union B? 

 {positive integers} 

 {integers} 

 {0} 

 { } 



 

Question 31 (Multiple Choice Worth 2 points)

[2.02] Solve for x: -3(x - 3) = 21 

 x = -10 

 x = 10 

 x = -4 

 x = 4

hero · Answer

@mcsmarty, for the first question, which choice do you believe is correct?

anonymous · Answer

integers so b

hero · Answer

Integers would include both positive and negative numbers. However sets A and B both include positive numbers that are either even or odd.

anonymous · Answer

so its positive

anonymous · Answer

a

hero · Answer

Positive Integers would be the correct choice because positive integers include all integers that are either even or odd and greater than zero.

anonymous · Answer

thanks nect one

hero · Answer

Have you attempted solving for x yet?

anonymous · Answer

yea I thinks its -10

hero · Answer

Did you check your answer? Do you know how to "check" after solving?

anonymous · Answer

ya u plug it in but they all came up with weird numbers that's were I need help

hero · Answer

Basically, there are two ways to solve the problem. You either use algebra or you use the check feature.

hero · Answer

You're already given the answer choices. If you select a choice and it doesn't pass the "check" move on to the next number.

anonymous · Answer

its either -10 or or -4 right?

hero · Answer

Well yes it is one or the other, but using the "check" feature, you should be able to figure out which of the two is correct.

anonymous · Answer

check feature on what open study or paper or internet

hero · Answer

For example, to check if it is -10, perform the following process: 

Replace x with -10, then simplify:

-3(-10 - 3) = 21
      -3(-13) = 21
              39 = 21 FALSE

hero · Answer

So based on that checking process, we conclude that -10 is not the correct choice since both sides are not equal.

hero · Answer

The correct x leads to both sides being equal

anonymous · Answer

-4

hero · Answer

Yes -4 is the correct choice, but the question is, do you know how to check and do you know how to solve the equation algebraically?

anonymous · Answer

yea I was doing something wrong I got it now