Explanation:
A set is "closed" for a particular operation if performing that operation on members of the set always gives a member of the set.
closed example
For example, the set {0, 1} is closed for multiplication:
0 × 0 = 0
0 × 1 = 0
1 × 1 = 1 . . . all result values are members of the set
Performing multiplication on any two members of the set gives a member of the set.
__
not closed example
The same set {0, 1} is not closed for addition:
0 +0 = 0
0 +1 = 1
1 +1 = 2 . . . not a member of the set
Performing addition on any two members of the set does not always give a member of the set.
_____
Additional comment
Sometimes you are asked to demonstrate closure of a particular set using a particular example. As we see with addition, above, some examples may seem to demonstrate closure, while another example may prove the set is not closed. In short, you can demonstrate that the set is closed for a particular operation on a particular example, but that does not demonstrate closure in general.
Which expression is equivalent to -6.5 - 5.1 + 2.3c - 1.8
Answer: 2.3c-13.4
Step-by-step explanation:
We can combine the constants and c's separately. We first do -6.5-5.1-1.8 which equals -13.4 and add that to 2.3c to get 2.3c-13.4
Answer:
Step-by-step explanation:
it’s actually-4.2c-69 :)
Dimond has 350$ in her bank account . She wrote 4 checks for 18.45$
each and 2 checks for 51.25$ each. what will be the balance in dimonds account after the checks are cashed?
Answer:
love
Step-by-step explanation:
Answer:
$173.70
Step-by-step explanation:
350-4(18.45)-2(51.25)=173.70
The width of a rectangle is 4t-1.5 feet and the length is 1.5t+5 feet. Find the perimeter of the rectangle.
Answer: P=2(l+w)=2·(1.5+4)=11 is the answr
Step-by-step explanation:
how do i find the perimeter of a triangle
Answer:
1/2 x base x height
Step-by-step explanation:
hope this helps!
Please help me I need it
Answer:
bro, i answered it already
in your previous question
the second 133.40
HELP NEEDED!! 30 POINTS! BRAINLY TO BEST
Answer:
18Step-by-step explanation:
By similar triangles law:-
[tex]\frac{24}{2x} =\frac{30}{x+6}[/tex]
[tex]24(x+6)=30(2x)[/tex]
[tex]24x+24(6)=60x[/tex]
[tex]24x+144=60x[/tex]
[tex]\frac{36x}{36x} =\frac{144}{36}[/tex]
[tex]x=4[/tex]
Since AB=x+6+2x
[tex]AB=3x+6[/tex]
Substitute value of x
[tex]AB=3(4)+6[/tex]
[tex]AB=12+6[/tex]
[tex]AB=18[/tex]
Therefore, the third side of ΔABC is 18.
~
Hope this helps!
A store had 150 Rams jerseys in stock on Friday. They had 100 jerseys left on Saturday. The amount went down by:
This was a
decrease (2nd response should be an answer with a percent)
Answer:
50
Step-by-step explanation:
8x²+10x
Greatest Common Factor
Answer:
gcf: Since
8
x
2
,
10
x
contain both numbers and variables, there are two steps to find the GCF (HCF). Find GCF for the numeric part then find GCF for the variable part.
Steps to find the GCF for
8
x
2
,
10
x
:
1. Find the GCF for the numerical part
8
,
10
2. Find the GCF for the variable part
x
2
,
x
1
3. Multiply the values together
Find the common factors for the numerical part:
8
,
10
The factors for
8
are
−
8
,
−
4
,
−
2
,
−
1
,
1
,
2
,
4
,
8
.
Tap for more steps...
−
8
,
−
4
,
−
2
,
−
1
,
1
,
2
,
4
,
8
The factors for
10
are
−
10
,
−
5
,
−
2
,
−
1
,
1
,
2
,
5
,
10
.
−
10
,
−
5
,
−
2
,
−
1
,
1
,
2
,
5
,
10
List all the factors for
8
,
10
to find the common factors.
8
:
−
8
,
−
4
,
−
2
,
−
1
,
1
,
2
,
4
,
8
10
:
−
10
,
−
5
,
−
2
,
−
1
,
1
,
2
,
5
,
10
The common factors for
8
,
10
are
−
2
,
−
1
,
1
,
2
.
−
2
,
−
1
,
1
,
2
The GCF for the numerical part is
2
.
GCF
Numerical
=
2
Next, find the common factors for the variable part:
x
2
,
x
The factors for
x
2
are
x
⋅
x
.
x
⋅
x
The factor for
x
1
is
x
itself.
x
List all the factors for
x
2
,
x
1
to find the common factors.
x
2
=
x
⋅
x
x
1
=
x
The common factor for the variables
x
2
,
x
1
is
x
.
x
The GCF for the variable part is
x
.
GCF
Variable
=
x
Multiply the GCF of the numerical part
2
and the GCF of the variable part
x
.
2
x
Step-by-step explanation:
Answer:
2x
Step-by-step explanation:
math guys
Solve the equation.
e
11
7
e
Stuck? Review related articles/videos or use a hint.
Answer:
[tex]\huge\boxed{\sf e =21}[/tex]
Step-by-step explanation:
Given equation:
[tex]\displaystyle \frac{e}{3} = 7\\\\Multiply \ both \ sides \ by \ 3\\\\e = 7 \times 3\\\\e = 21\\\\\rule[225]{224}{2}[/tex]
Hope this helped!
~AH1807If x < 5, find Ix - 5l.
Help me please
Answer:
b is you answer hope it helps you
7,002 divided by 53 estimate
Answer:
132.11
Step-by-step explanation:
7002 ÷ 53 = 132.11
Thus, The answer is 132.11
-TheUnknownScientist 72
I need help with this function question please
Answer:
The answer is San Francisco.
Step-by-step explanation:
For New York City, when there 0 miles traveled the total cost is $2.50, where as in San Francisco it is $2.85.
As you can see San Francisco has a higher rate of ($2.85).
Hope that helps!
Suppose that a rectangular piece of glass has a perimeter of 20 meters. If we multiply both its length and its width by 4, what will be the perimeter
of the new rectangular piece of glass?
A) 65 m
B) 80 m
C) 34 m
D) 45 m
Answer:
B) 80 m
Step-by-step explanation:
Let W = width
Let L = length
perimeter of a rectangle = 2 x width + 2 x length = 2(W + L)
If the perimeter of a rectangle = 20 m
⇒ 2(W + L) = 20
If we multiply both its length and width by 4:
Width = 4W
Length = 4L
⇒ perimeter = 2(4W + 4L) = 8(W + L)
As 2(W + L) = 20
Then 8(W + L) = 4 x 2(W + L) = 4 x 20 = 80 m
Suppose f(x) = x3 + 4. Find the graph of
1
f(x).
Click on the correct answer.
graph 1
graph 2
Answer: its graph 2 becuse it goes through a y intercept of 4 nd isnt negtive. If the formula was negative it would be on the left side/ Correct answer has to be "2"
Step-by-step explanation:
what percent of 30 is 18
Answer: 60
Step-by-step explanation:
x%30 = 18
x = 18 * 100 / 30 = 18 * 10 / 3 = 60
What is the square root of 30?
Answer:
The square root of 30 is a decimal 5.477...
Step-by-step explanation:
The square root of 30 = 5.477 rounded up is 5.5
ok so hi I need help with this
Answer:
x=-5, 5
Step-by-step explanation:
Because there is absolute value symbol and is equal to 5.
f-9+4=22
pls some help it's worth 14 points enough for 2 questions pls answer
Answer:
F = 27
Step-by-step explanation:
you subtract 27-9+4
Answer:
f = 27
Step-by-step explanation:
f - 9 + 4 = 22
f-5 = 22
Add the numbers
↓
f = 27
PLEASE HELP
The graph shown models the speed of a racecar during part of a lap.
Take on the role of a racing announcer and create a story to describe what the graph reveals about the race. Include the following information in your story:
What do the line segments R, S, T, U, and V reveal about the speed of the car?
Include information about the speeds and times when writing your story.
Answer:
A racer has just completed his first lap at a speed of 198m/s. Now his speed decrease or he decelerateted at 195m/s after 2s of his completion of first lap, as soon as he saw a curve path(line segment R). He then moved at a constant speed of 195m/s for the next 2s(line segment s). Then the race track after 4s of the completion of first lap was straight, so the racer accelerated to 200m/s within 2s( line segment T) and traveled at a constant speed for the next 6s( line segment U). After 12s from the first lap completion, he immediately saw a curve track, so he decelerateted to the speed of 194m/s within 3s( line segment V).
Hope it helped.
please mark brainliest
Solve the problem and explain the steps taken.
There are four students working on a project in math class. Miguel has completed 1/8 of the project, Gina has
completed 13% of the project, Jatziry has completed 0.10 of the project, and Kwa has completed 1/9 of the
project Make a list of the students in order from least to greatest by the amount of the project they have
completed
Study the triangle. What can you conclude about the angle measures?
The angle measures are 30°, 60°, and 90°.
The angle measures are 45°, 45°, and 90°.
The triangle has a 90° angle, but the other angle measures cannot be determined.
Triangle A B C is shown. Angle A B C is a right angle. The length of A B is 4, the length of C B is 4 StartRoot 3 EndRoot, and the length of hypotenuse C A is 8.
Answer:
A
Step-by-step explanation:
For a right triangle, one of tha angles must be 90degrees. For the given right angles, the measure of its acute angles are 30, 60 and 90degrees respectively
Types of trianglesTriangle is a 2-D shape that has 3 sides and angles. Some of the types of triangle include:
Right triangleObtuse triangleScalene triangleEquilateral triangleFor a right triangle, one of tha angles must be 90degrees. For the given right angles, the measure of its acute angles are 30, 60 and 90degrees respectively
Learn more on right angles here: https://brainly.com/question/24323420
#SPJ2
Find the area of the triangle
13
07
5
12
O 65 units?
O 30 units?
O 60 units
O 156 units
Find the values of x and y.
Please explain how you got your answer
(i won't be clicking on anything that looks sketchy)
Answer:
x=10º
y=20º
Step-by-step explanation:
7x+90+20=180º
7x=70º
x=10º
5x+2y=90º
5(10)+2y=90
2y=40
y=20º
Please give me brainly o3o
Which equation represents the relationship between r and s? A) s = 1 6 r B) r = s - 5 6 C) s = r - 5 6 D) r = 1 6 s
Answer:
a because that what I got
CONVERT 12-HOUR TO 24-HOUR
1. 3:26 PM
2. 3:26 PM
3. 11:05 AM
4. 9:35 AM
Answer:
1) 15:26 PM
2) 15:26 PM
3) 11:05 AM
4) 9:35 AM
Step-by-step explanation:
I hope this helps!!How do you multiply two scientific notation values? Explain the steps you would take to find the product of 6. 7 × 106 and 3. 2 × 105 written in scientific notation.
The product of 6.7 × 10⁶ and 3.2 × 10⁵ can be written in scientific notation is 2.144 × 10¹².
What is multiplication?It is also known as the product. If the object n is given to m times then we just simply multiply them.
The two numbers are [tex]\rm 6.7*10^6 \ and \ 3.2 * 10^5[/tex]
Then find the product of these two numbers.
To multiply these terms is very simple.
First, multiple 6.7 and 3.2 simply. And the power of 10 gets added. That is
[tex](6.7*10^6) * (3.2 * 10^5) = 6.7 * 3.2 * 10^6 *10^5\\\\(6.7*10^6) * (3.2 * 10^5) = 21.44* 10^{6+5}\\\\(6.7*10^6) * (3.2 * 10^5) = 21.44 *10^{11}\\\\(6.7*10^6) * (3.2 * 10^5) = 2.144* 10^{12}[/tex]
The product of 6.7 × 10⁶ and 3.2 × 10⁵ can be written in scientific notation is 2.144 × 10¹².
More about the multiplication link is given below.
https://brainly.com/question/19943359
HELP IM STRUGGLING REAL BAD WITH THSI
Answer:
GI = 72
Step-by-step explanation:
[tex]GI=48+HI[/tex]
[tex]\frac{48}{HI} =\frac{30}{15}[/tex]
[tex]HI=\frac{(48)(15)}{30} =\frac{720}{30} =24[/tex]
Then:
[tex]GI=48+24=72[/tex]
Hope this helps
What is the slope of y = 4x - 7
PLEASE SHOW WORK
ASAP!
The slope of an equation of a line is the number that is in front of the x,,
In y=4x-7 the slope would be 4
Answer: 4
oml....help me please this doesn't make sense
Are you clever enough????
What is the answer on the graph?
Thnx