the difference of twice a number and 3 is -21
Answers
Answer:
-9
Step-by-step explanation:
To answer this question, you have to know how to translate what is asked in words into equation form.
The word difference means subtractions. For example, the difference of 8 and 3 is 5. In equation form, this means " 8 - 3 = 5 "
To say "twice a number" means to have a number twice, which is multiplication. Since we don't know what the number is, we will call it x.
So to put the proposed question in equation form, we would say "2x - 3 = -21"
Now that we've got the equation, we can now solve for x. To do this, we group the like terms first. In this case it's -3 and -21. The easiest method would be to move the -3 to the other side of the equals sign, but in order to do this we have to change the sign of the -3. So your equation now looks like this
2x = -21 + 3
At this point, we add -21 and positive 3, which equals -18, so now we have
2x = -18
Now, in order to get x by itself, we need to look at the main operation on the left side of the equation. The main operation is multiplication because "2x" really means "2 multiplied by x". So in order to get x by itself, we need to move 2 over to the other side of the equation. Since division is the opposite of multiplication, we divide both sides by 2. If we divide the left side by 2, we are left with x by itself because 2 divided by 2 =1, meaning we have 1x, or simply put, just "x".
However on the other side of the equation, we divide that as well by 2. So -18 divided by 2 is -9
The answer is x = -9
Related Questions
If the relationships below are given in the form (input, output), which pairing always describes a function? (a person’s age in years, that same person’s height in inches) (a person’s weight in pounds, that same person’s height in inches) (a person’s height in centimeters, that same person’s height in inches) (a person’s telephone number, that same person’s height in inches)
Answers
Answer:
A function is a mathematical relation in which each input (domain value) is associated with exactly one output (range value). In other words, for a relation to be a function, each input can have only one corresponding output. Let's analyze the given pairings:
(a person’s age in years, that same person’s height in inches) - This can be a function because one person's age in years should correspond to a single height in inches.
(a person’s weight in pounds, that same person’s height in inches) - This can also be a function because one person's weight in pounds should correspond to a single height in inches.
(a person’s height in centimeters, that same person’s height in inches) - This can be a function because one person's height in centimeters should correspond to a single height in inches.
(a person’s telephone number, that same person’s height in inches) - This may not necessarily be a function. It's possible for two different people to have the same height in inches but different telephone numbers.
So, the pairings that always describe a function are:
(a person’s age in years, that same person’s height in inches)
(a person’s weight in pounds, that same person’s height in inches)
(a person’s height in centimeters, that same person’s height in inches)
These three pairings meet the criteria of a function, where each input corresponds to a unique output.
The pairing that always describes a function is option C. (a person’s height in centimeters, that same person’s height in inches)
How did we arrive at this assertion?A pairing describes a function when each unique input (domain element) is associated with exactly one unique output (range element). In other words, there should be no ambiguity or multiple outputs for a single input. Let's analyze the given pairings:
1. (a person’s age in years, that same person’s height in inches): This pairing may not always describe a function because multiple people can have the same age, but they might have different heights. So, there can be multiple outputs for the same input (age).
2. (a person’s weight in pounds, that same person’s height in inches): Similar to the first pairing, this may not always describe a function because different people can have the same weight but different heights.
3. (a person’s height in centimeters, that same person’s height in inches): This pairing describes a function because for each unique height in centimeters, there is only one corresponding height in inches.
4. (a person’s telephone number, that same person’s height in inches): This pairing may not always describe a function because multiple people can have the same telephone number, but they might have different heights. So, there can be multiple outputs for the same input (telephone number).
So, the pairing that always describes a function is: (a person’s height in centimeters, that same person’s height in inches)
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Some students recorded how many minutes they spent on the phone in one day. They put the results in a Stem-and-Leaf Plot.
What is the mean number of minutes spent on the phone?
Answers
Explanation:
The data from the stem-and-leaf plot is:
10,
24,25,26,
30,30,32,33,
40,45,46
Add up those values
10+24+25+26+30+30+32+33+40+45+46 = 341
Then divide over n = 11 which is the sample size.
341/11 = 31 is the arithmetic mean.
Answer:
341/11 = 31 is the arithmetic mean.
Step-by-step explanation:
can someone help me with this question?? its due midnight so if u see this after midnight u dont need to answer
Answers
FShe is a workerhefgkutfytvvhgvehgvxhhgvaghecCqe
Use the Midpoint Rule with \(n=5\) to estimate the volume obtained by rotating about the y-axis the region under the curve \(y=\sqrt{1+x^3}\), \(0\leq x\leq 1\).
Answers
To estimate the volume using the Midpoint Rule with \(\displaystyle n=5\), we need to divide the interval \(\displaystyle 0\leq x\leq 1\) into \(\displaystyle n\) subintervals of equal width. Since \(\displaystyle n=5\), each subinterval will have a width of \(\displaystyle \Delta x=\frac{1-0}{5}=\frac{1}{5}\).
Now, let's calculate the volume using the Midpoint Rule. The formula for the volume obtained by rotating about the y-axis is:
\(\displaystyle V\approx 2\pi \sum _{i=1}^{n}y_{i}\Delta x\)
where \(\displaystyle y_{i}\) represents the value of the function \(\displaystyle y=\sqrt{1+x^{3}}\) evaluated at the midpoint of each subinterval.
First, let's find the midpoints of the subintervals. Since the width of each subinterval is \(\displaystyle \Delta x=\frac{1}{5}\), the midpoint of the \(\displaystyle i\)-th subinterval is given by:
\(\displaystyle x_{i}=\frac{\Delta x}{2}+\left( i-\frac{1}{2}\right) \Delta x=\frac{1}{10}+\left( i-\frac{1}{2}\right) \frac{1}{5}\)
Substituting \(\displaystyle x_{i}\) into the function \(\displaystyle y=\sqrt{1+x^{3}}\), we obtain:
\(\displaystyle y_{i}=\sqrt{1+\left( \frac{1}{10}+\left( i-\frac{1}{2}\right) \frac{1}{5}\right) ^{3}}\)
Now, we can calculate the approximate volume using the Midpoint Rule:
\(\displaystyle V\approx 2\pi \sum _{i=1}^{5}y_{i}\Delta x\)
Substituting the values of \(\displaystyle y_{i}\) and \(\displaystyle \Delta x\) into the formula, we can evaluate the sum and compute the estimated volume.
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♥️ \(\large{\underline{\textcolor{red}{\mathcal{SUMIT\:\:ROY\:\:(:\:\:}}}}\)
pls help this is due tom
Answers
Answer:
k = 45
Step-by-step explanation:
Emmett deposited $90 in an account earning 4% interest compounded annually.
To the nearest cent, how much INTEREST will he earn after two years? (Hint: You are finding the interest, not the total amount in the account.)
Responses
$7.34
$97.34
$10.34
$90.00
Answers
Answer:
7.34
Step-by-step explanation:
Is your math teacher in K12 Mrs Stucker?
Which quantity is greater than |–2.4|?
A.–6.3
B.–3
C.|–3.75|
D.|–1|
Answers
Answer:
The answer is D
the answer is D because it goes -1 then -2 then -3 and so on
Circle P has a circumference of approximately 75 inches
What is the approximate length of the radius, n Use 3 14
for . Round to the nearest inch
12 inches
24 inches
38 inches
046 inches
Answers
Answer: The radius is 12.
Step-by-step explanation:
75/n where N is representing pie. We have to divide pie to find the diameter.
75/3.14= 24 Now we know the diameter is about 24 so we will divide by 2 to find the radius.
24/2=12
Answer:
1) 12in
Step-by-step explanation:
The circumference is 75, so to find the diameter you have to divide 75 by 3.14. You get 24 approximately. Then divide the diameter by 2, so 24/2=12.
I need to turn it in by 5pm Please Help!!!!!
At the movies, you order 3 boxes of popcorn and a bottle of water. The cost of the bottle of water is $1.75. Your total cost is $9.25. Write an EQUATION to find the cost of one box of popcorn.
Answers
A bottle of water is $1.75
$9.25 - $1.75 = $7.5 (the price of 3 boxes of popcorn)
We divide $7.5 by 3 to know the price of one box of popcorn
$7.5 : 3 = $2.5
One box of popcorn costs $2.5
Answer:
Step-by-step explanation:
$9.25-$1.75=7.5
now you divide 7.5 by the number of popcorn have brought
$7.5 divided by 3= $2.5
Which scenario can be modeled by the linear function
y = -15x + 500?
A. The temperature on Jupiter is
15℉ and increases by 500℉ every day.
B. There is a population of 500 giraffes in Western Africa that decreases by 15 giraffes each year.
C. A carpet cleaning service charges $500 plus an additional $15 for every hour.
D. A membership fee for a movie streaming service is free, but each rental costs $15.
Answers
Denzel decided to look at new and used trucks. Denzel found a used truck for $36000. A new truck is $40000, so what percent of the price of a new truck does Denzel pay for a used truck?
Answers
This would be 56%
(Sorry if that’s wrong)
I don't get it........
Answers
Answer:
H. 32w = 496
Step-by-step explanation:
Since the length is 32 and you have the total area all you have to do is divide 496 by 32. And because w stands for width, you just solve for w.
I hope this helps :)
32 times w is 496
hunter has to raise $210 for his soccer team's new uniform so far he gas raised $63 what percentage of his goal has hunter raised
Answers
Answer:
$63 is 30% of 210
Step-by-step explanation:
take 63 and divide it by 210 then multiply by 100
A grocery store received two shipments of watermelon. Each watermelon in a shipment was weighed, then a line plot was made of all of the weights in a shipment.
What statement about the two plots’ distributions is true?
The degree of overlap between the two distributions is high.
There is no overlap between the two distributions.
The degree of overlap between the two distributions is low.
The degree of overlap between the two distributions is moderate.
Two line plots with the same scale and interval, from fifteen to twenty-five, with tick marks every one unit. The plots are stacked vertically for comparison. Values appear as x marks above the line. Each plot has eighteen data values. Upper plot is labeled Shipment 1.
Lower plot is labeled Shipment 2. Under each plot is the label Weight, in pounds. Upper plot data values are one x mark above sixteen, one x mark above seventeen, one x mark above eighteen, one x mark above nineteen, two x marks above twenty, three x marks above twenty-one, four x marks above twenty-two, three x marks above twenty-three, three x marks above twenty-four, and one x mark above twenty-five. Lower plot data values are one x mark above sixteen, two x marks above seventeen, three x marks above eighteen, four x marks above nineteen, three x marks above twenty, three x marks above twenty-one, two x marks above twenty-two, zero x mark above twenty-three, and one x mark above twenty-four.
Answers
Answer:I have no idea
Step-by-step explanation:
( WILL MARK BRAINLIEST!! ) Southeast Asia is know as "the Crossroads of the World" because it is located along important trade routes.
A. true
B. false
Answers
Answer: The answer to your question is
A) True.
Answer:
true
Step-by-step explanation:
i will put a answer up in 3 hours i have 30,000 points so be ready
Answers
Answer:
we need more people like you
Step-by-step explanation:
thank you!
Answer:
ok
Step-by-step explanation:
A baseball team played 75 games and lost 20% of them. How many games did the team lose? 15 20 55 60
Answers
Answer:
15
Step-by-step explanation:
1. Change 20% to a decimal
2. 0.20
3. Multiply 75 by 0.20
4. You get 15
Check?
1. 15/75= 0.2
2. 0.2= 0.20= 20%
(:
Please Help me! Please complete everything! Kiki’s grandmother gives her two empty piggy banks. Kiki decides to add 1
penny to Piggy Bank 1 each day. She also decides to add 2 pennies to
Piggy Bank 2 each day. Day 1 is completed for you.
(a)Complete this table to show how many pennies are in the piggy banks
for the first five days that Kiki has them
Answers
Answer:There are 15 Pennie’s in the piggy banks
Step-by-step explanation:
X=1,2,3,4,5
Y=2,4,6,8,10
Total pennies=15
andrew is applying for a job which requires him to type at least 120 words per minute. he took an 850-word typing test in 7 minutes. does he meet the job requirements?
Answers
Answer:
yes
Step-by-step explanation:
yes, andrew types approximately 121 words per minute
Classify the shapes shown below. Write the letter of each shape in the category that
describes it. Shapes may fall into more than one category, and not all shapes will be
used.
Answers
Answer:
no shapes have been shown below
something's missing in this question
Can someone help me please and plz explain ur answer
Answers
Answer:
Unbiased because the servey was not taken by a specific group of people. Instead, the servey is taken by random people at the shopping mall.
Answer:
Unbiased
Step-by-step explanation:
Because in the dictionary it says showing no prejudice for or against something; impartial. "his assessment of the benefits and drawbacks was unbiased." So when I read that, it was not prejudice, it was showing that whoever started the survey, was not prejudice, cus he was trying to help the company. Hope this helps you :)
What is the area of the circle? Approximate using pi equals 22 over 7.
a circle with radius labeled 35 yards
110 square yards
220 square yards
3,850 square yards
15,400 square yards
Answers
ANSWERRRR:
the answer is 15,400
-3 + 6x. Which expression shows the correct factorization?
Here are the ones to pick from
1. -2 + -2 +6 +x
2. 6(-2 +x)
3. 6(-2 +x)
4. -3 (1 - 2x)
Answers
Answer:
Option #4
Step-by-step explanation:
Expand option #4
=-3(1-2x)
=-3 -2x*-3
=-3+6x which is what your original equation was.
Suppose you borrow money for a year at a simple interest rate of 7.2%. You pay $86.40 in interest. How much have you borrowed?
Answers
Answer:
$1200
Step-by-step explanation:
You want to know the amount borrowed at 7.2% if the simple interest for one year is $86.40.
InterestThe interest formula is ...
I = Prt
where P is the amount borrowed, r is the interest rate, and t is the number of years.
ApplicationUsing the given values, we have ...
86.40 = P·0.072·1
P = 86.40/0.072 . . . . . . divide by the coefficient of P
P = 1200
You have borrowed $1200.
Answer: 1200
Step-by-step explanation: Linear equation. 7.2x = 100(86.40). then divide by 7.2 on each side. x=1200
Work out the size of angle m.
Answers
Answer:
78+25+61+55+64=283
360-283=77
180+77=257
If you add up all the provided angles you get 283 degrees
The remaining angle to get to 360 is 77 since 360-283=77
Answer: m=77
Hope this helped!
What kind of symmetry does this figure have?
point
line
both line and point
neither
Answers
Answer:
line and point
Step-by-step explanation:
The kind of symmetry the figure given above posses is a line and point symmetry.
What is point symmetry?A point Symmetry also known as origin symmetry is a Symmetry which occurs when every part of an object has a matching part. That is, the same distance from the central point but in the opposite direction.
Given that;
The objects looks the same when viewed from opposite directions.
We know that;
A line of symmetry is a line that cuts a shape exactly into two equal half. That is, if you fold the shape along the line, both halves would match exactly.
Therefore, the figure given above has both point and line Symmetry.
Learn more about line and point symmetry:
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Please help! Thank you!
Answers
Answer:
525
Step-by-step explanation:
If it's just asking to find the average of heads then times it by 20 then just do 32+28+21+24 to get 105 and divide it by 4 to get 26.25 then times it by 20 since this is the average of 50 throws and it's asking for the average of 1,000 throws which is 525
what is 30 digits of pi?
Answers
Answer:
3.141592653589793238462643383279
Step-by-step explanation:
Please mark me as brainless hope It helps
Point A, located at (5, -4) is reflected in the y-axis, resulting in the location of point A'. Which of the following statements is true?
Point A' is located at (-5,-4)
Point A' is located at (-5,4)
Point A is located at (4,5)
Point A' is located at (-4,5)
Answers
The correct answer is Point A' is located at (-5, -4).
When a point is reflected in the y-axis, its x-coordinate is negated and its y-coordinate remains the same. Therefore, the x-coordinate of point A changes from +5 to -5, and the y-coordinate remains -4. Hence, the coordinates of A' are (-5, -4).
A woman wants to measure the height of a nearby building. She places a 2m pole in the shadow of the building so that the shadow of the pole is exactly covered by the shadow of the building.The total length of the building's shadow is 58m, and the pole casts a shadow that is 2.75m long. How tall is the building? Round your answer to the nearest meter. (The figure is not drawn to scale.)
Answers
Answer:
61meters
Step-by-step explanation:
rounded off from 60.75m