Question

The set {0, 1} is closed under which operation?
multiplication <-- my answer
addition
subtraction
none of the above



Question 2.2. Find A ∩ B

A = {2, 3, 4, 5, 6} B = {3, 6, 9, 12, 15}

{3, 6} <--

{2, 4, 5, 9, 12, 15}

{2, 4, 5}

{9, 12, 15}

Answer 1

@mathstudent55

Answer 2

looks fine to me

Answer 3

Question 1.
Multiplication and Addition. Not subtraction.

Answer 4

Question 2.2 is correct.

Answer 5

I can only pick one though :/ Which one would be better?

Which expression is greater than |0.4|?

|(0.4)| <--

((0.4))

|(0.4)|

|0.4|



Question 4.4. Which number is one-fourth of the way between 3 and 11.4?

5.1 <--

8.4

9.3

14.4

Answer 6

4.4 is correct.

Answer 7

Okay, is the one above that correct?

Answer 8

In the first question multiplication and addition are equally correct, so picking multiplication is fine.

Answer 9

Which expression is greater than |0.4|?

|(0.4)| <--

((0.4))

|(0.4)|

|0.4|

Answer 10

Does the double parentheses have a special meaning? I am not familiar with that.

Answer 11

We did not discuss it in class so I am unsure. and I actually typed it wrong. Let me retype it.

Answer 12

Also, choices A and C are the same.

Answer 13

Which expression is greater than -|-0.4|?

|-(-4)|

-(-(-0.4))

-|-(-0.4)|

- |-0.4|

Answer 14

Oh, ok. This is much better.

Answer 15

Yeah sorry. You need the negatives! Haha

Answer 16

Any expression with 0.4 in it can only be 0.4 or -0.4, ok?

Answer 17

Okay

Answer 18

That means choices B, C, and D can be at most 0.4.

Answer 19

Now let's look at choice A.

Answer 20

Okay

Answer 21

|-(-4)| =
First, what is -(-4) = ?

Answer 22

4

Answer 23

Right, so you have
|-(-4)| = |4| =
What is absolute value of 4?

Answer 24

4!

Answer 25

Be careful. In math, the exclamation mark actually has a meaning. :-)
4! = 4 * 3 * 2 * 1 = 24
(Look up "factorial" in a math textbook.)

I know what you mean.
|4| = 4
Since the first expression has a value of 4, and all others can be at most 0.4, then the answer is A.

Answer 26

Oh opps I didnt know that the exclamation mark meant anything!

Okay awesome sauce! I just have two more that need checked :) Which Im sure are right I am very careful though. I like getting a good grade. :)

Answer 27

Wait a minute.
I just noticed that your question also changed when you retyped the problem.

Answer 28

Hmm?

Answer 29

Which expression is greater than -|-0.4|?

Answer 30

Yes

Answer 31

First let's see what the question is.
-|-0.4| = -0.4

Answer 32

That means any number in the choices that is larger than -0.4 is good.

Answer 33

What is the value of (x + 6)(x 1) when x = 1?

6

1

0 <--

5

Which property is shown?

(5x 3) + (5x 9) = 5 x(3 + 9)

Multiplicative Identity

Distributive Property <--

Multiplicative Inverse Property

Commutative Property of Multiplication

Answer 34

Oh okay. Well Im sure A can be correct.

Answer 35

Now let's see the choices again.

Answer 36

Which expression is greater than -|-0.4| = -0.4?

A |-(-4)| = 4
B -(-(-0.4)) = -0.4
C -|-(-0.4)| = -0.4
D -|-0.4| = -0.4

Only A is correct.

Answer 37

Okay so if A were to be |-(-0.4)| it would still be correct?

Answer 38

(I only have 15 mins left on my computer before it is my brothers turns.)

Answer 39

@mathstudent55 ?

Answer 40

(x + 6)(x 1)
What does the second set of parentheses mean?
I don't see an operation between x and 1.