255^2-245^2=_
Don't solve using a calculator, is there a trick to solving this without a calculator?
thanks, please don't spam!
Answers
Recall that
(a + b)² = a² + 2ab + b²
Then we write
255² - 245² = (245 + 10)² - 245²
… = (245² + 4900 + 10²) - 245²
… = 4900 + 100
… = 5000
255 - 245 = 10
The ^2 means add two decimal points after the 10 in the positive direction since it’s ^+2
So 1000
255^2 =25500
245^2 = 24500
25500 - 24500 = 1000
Related Questions
Please help me I neeeeeddddddd heeeeeeellllllllpppppppp
Answers
478 x 38 = 18,164
4/9 x 3 = 12/9
3.98 + 0.432 = 4.412
2.6 - 0.75 = 1.85
The order from least to greatest of the given number set is 6.478, 6.5, 6.503, 6.6.
1) Given that, 843×61 and 478×38.
Here, 843×61 = 51423 and 478×38=18164
2) The given table with x+1 and y+3.
Here, put x= 1, 2, 3, 4,....in x+1, we get 2, 3, 4, 5,....
Put y=1, 2, 3, 4,...... in y+3, we get 4, 5, 6, 7,......
3) Given that, 4/9 ×3
= 4/3
4) The given numbers are 6.5, 6.503, 6.6, 6.478
Now, the order from least to greatest is 6.478, 6.5, 6.503, 6.6
5) 3.98+0.432=4.412
2.6-0.75= 1.85
Learn more about the order of a numbers visit:
https://brainly.com/question/13115394.
400 ducks consume a reservoir of feed in 30 days, how long will it take 500 ducks
Answers
Answer:
24 days.
Step-by-step explanation:
First lets look at the facts.
400 ducks can eat a bunch of feed in 30 days.
That means that 200 ducks would take 60 days.
100 ducks would take 120 days.
Now, we must multiply 100 by 5 to get 500, the target amount of ducks, and divide 120 by 5 to get 24. So, 500 ducks can eat a reservoir of feed in 24 days.
Answer:
24 days
Step-by-step explanation:
It is an inverse proportion, the more ducks the less days the food lasts
400 ----- 30
500 ----- X
\(x=\frac{(400)(30)}{500} =\frac{12000}{500} =24\)
Hope this helps
A restaurant chef wants to install a new floor in her kitchen. The kitchen measures 8 yards wide and 12 yards long, and the flooring costs $2.00 per square yard. How much will the chef's new floor cost?
Answers
Answer:
The answer is the chef's new floor will cost 40 dollars
Step-by-step explanation:
1. 8 yards and then 2 dollars so do 8x2=16
2. Then do 12 yards then 2 dollars so do 12x2=24
3. Then add up 16+24=40
Write an equation of a line perpendicular to line AB in slope-intercept form that passes through the point (7, 6).
y = 0.5x + 2.5
y = 0.5x − 2.5
y = −2x + 20
y = 2x − 20
Answers
The equation of a line perpendicular to line AB in slope-intercept form is
\(y=0.5x+2.5\)
Graph :
We are given with a graph of a line ABEquation of a line perpendicular to AB passes through point (7,6)From the slope of line AB using any two points from the given line
A is (0,1) and B is (-2,5)
lets find out slope using slope formula
\(slope =\frac{y_2-y_1}{x_2-x_1} =\frac{5-1}{-2-0} =-2\)
Slope of perpendicular lines are negative reciprocal of one another
Slope of perpendicular line is \(\frac{1}{2}\)
Use point slope formula to find equation of the line
\(m=\frac{1}{2} , (7,6)\)
Point slope formula
\(y-y_1=m(x-_1)\\y-6=\frac{1}{2} (x-7)\\y-6=0.5x-3.5\\y=0.5x-3.5+6\\y=0.5x+2.5\)
The equation of a line perpendicular to line AB in slope-intercept form is
\(y=0.5x+2.5\)
learn more about the perpendicular lines here:
brainly.com/question/2863358
*PLEASE HELP* * IF YOU DONT KNOW, DONT ANSWER* *IRRELEVANT ANSWERS WILL REPORTED * a
bricklayer is building a garden retaining wall. 5 hours into the second day she stacked 850 bricks. 9 hours into the second day she stacked 1330.
How many bricks does she stack per hour?
How many bricks had been stacked on the first day?
(No picture provided)
Answers
Rate of change=Slope:-
\(\\ \tt\hookrightarrow m=\dfrac{1330-850}{9-5}=\dfrac{480}{4}=120\)
120bricks/hourEquation in point slope form
\(\\ \tt\hookrightarrow y-850=120(x-5)\)
\(\\ \tt\hookrightarrow y-850=120x-600\)
Convert to slope intercept form\(\\ \tt\hookrightarrow y=120x+250\)
250 bricks stacked on the first dayAnswer:
How many bricks does she stack per hour? 480
What is the answer to the word problem?
Answers
Answer:
7875
Step-by-step explanation:
As you know he sells 11 and 17 cars. So what I did is subtract 17 from 11. Which got me six. Then, I subtracted 6815 from 4565 which got me 2250. So, I divided 2250 by 6 which got me 7875.
Hope this helps!
Determine which expression is equivalent to the expression 5 over 4 times g minus 3 minus 7 over 12 times g minus the expression one over 3 times g plus 15
Answers
Answer:-4/15 - 17
negative 4 over 15 plus negative 17
Explain: negative 4 over 15 plus negative 17
The _____ is the result of the sum of the numbers being divided by how many numbers there are in the set.
A.mean
B.set
C.middle
D.median
Answers
Answer:
the mean is the result of the sum of the numbers being divided by how many numbers there are in the set.
A. mean
pls hellp i give brainliest
Answers
Answer:
C
Step-by-step explanation:
just use a site called DESMOS for these then type in the equations then match one that look like it and that's your answer
Question
Quality control finds on average that 0.045% of the items from a certain factory are defective. One month, 4500 items are checked.
How many items are expected to be defective?
Round your answer to the nearest whole number.
1 item
2 items
12 items
20 items
Answers
( 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:
im on ixl rn what is mean median mode and range
Answers
Tree factories build the same widget. Th number of widgets produced in each factory are shown in the table.
TABLE
(Hours) (Factory A) (Factory B) (Factory C)
1 8 9 6
3 24 18 18
6 42 27 36
Only one of the factories produces widgets at a constant rate.
Which equation represents y, the number of widgets produced in x hours, for the one factory that produces widgets at a constant rate?
A. y = 3x
B. y = 6x
C. y = 8x
D. y = 9x
Answers
Answer:
1 8 9 6
y= 3x
Step-by-step explanation:
Answer:
b
Step-by-step explanation:
The mean of 4 numbers is 19. What would the new mean be if the number 30 is added to the data set?
A.
49
B.
21.2
C.
26.5
D.
17.2
Answers
Answer:
B 21.2
Step-by-step explanation:
Im not sure at all tho. But I hope this helps :/
2, 3, 5, 9, 17, 22, 31, 39
Regina kept track of the points she scored during her team’s first eight basketball games. What is Regina’s mean score?
Responses
A 3939
B 1616
C 3737
D 1313
E 17
Answers
Answer:
Mean = 16
Step-by-step explanation:
MEAN can be find bg the sum of all score divided by the amount of the score.
Mean = total amount / number of amount
Total amount = 2 + 3 + 5 + 9 + 17+ 22 + 31 + 39
= 128
number of amount = 2, 3, 5, 9, 17, 22, 31, 39
= 8
Then we can calculate mean as
Mean = 128/8
Mean = 16
2+3+5+9+17+22+31+39=128
128/8=16
Which is an equivalent expression for (32 • 54)3?
32 • 512
35 • 57
36 • 512
1518
Answers
Because you distribute the three to the 54.
Kelly bought 8 apples, 3 pears and 13 oranges and brought them home in a grocery bag. She picks one out without looking at what is the probability (in a fraction) of her getting a pear? An apple? Or a pear. brainleist to first to answer.
Answers
Answer:
The chances of choosing an apple are 8/24 = 1/3
The chances of choosing an pear are 3/24 = 1/8
Step-by-step explanation:
Answer:
Step-by-step explanation:There are 152 apples.
The explanation is shown below:
- You need to write the following three equations, where is the the number of apples, is the number of pears and is the number of oranges:
1)
2)
3)
- You must substitute the equation 3) into the equation 2):
- Now, you need to solve for in the equation 1) and then you must substitute it into :
- Solve for , as following:
- Therefore, there are 152 apples.
easy math i'll mark brainliest
Answers
Q7: D
Q8: B
Step-by-step explanation:
Q7:
A cuboid is a three-dimensional shape, having six faces, where all the faces (top, bottom, and lateral faces) of the prism are rectangles, and every two opposing side faces are identical.
Therefore a cuboid is a rectangular prism.
Q8:
Volume of a cube
= l³
= 6 x 6 x 6
= 216 m³
2. B 216m^3
Help Please I will Give Brainliest if Correct!!
Answers
Answer:
1/25 k^2
Step-by-step explanation:
A flower was 1.6 meters high one week ago. In 7 days it grew 11 centimeters. What is the current height of the flower?
Answers
Answer:
The current height of the flower is 1.71 meters!
I hope this answer helped you!!!
Step-by-step explanation:
I took the test!!!
2. The formula for the surface area of a cube is 6s. Find the
surface area of a cube with a side length of 3 inches.
A. 36 sq. in.
B. 54 sq. in.
C.
81 sq. in.
D. 324 sq. in.
Answers
Explanation:
In order to use the formula of 6s we first need to find the surface area of one side. To do this we just need to do 3^2 or 3•3. After doing this you’ll get 9 and so now you can do 6s with s being equal to 9. 6•9 equals 54
What is the constant of proportionality in the equation y=1/2x?
Constant of proportionality=
Answers
Answer:
\(\frac12\)
Step-by-step explanation:
Hello!
Equation of a Line: \(y = mx + b\)
y = outputm = slope (constant of proportionality)x = inputb = y-interceptGiven our equation: \(y = \frac12 x\\\)
slope = 1/2y-intercept = 0Since the slope is the same as the constant of proportionality, the answer is 1/2.
The stem-and-leaf plot displays data collected on the size of 15 classes at two different schools.
Mountain View School Seaside School
0 5, 8
9, 8, 2, 0 1 0, 1, 2, 5, 6, 8
8, 7, 6, 5, 5, 4, 4, 3, 1, 0 2 5, 5, 7, 7, 8
0 3 0, 6
Key: 2 | 1 | 0 means 12 for Mountain View and 10 for Seaside
Part A: Calculate the measures of center. Show all work. (2 points)
Part B: Calculate the measures of variability. Show all work. (1 point)
Part C: If you are interested in a smaller class size, which school is a better choice for you? Explain your reasoning. (1 point)
Answers
For Mountain View School:
Data: 0, 0, 0, 0, 1, 2, 3, 4, 4, 5, 5, 5, 5, 6, 7, 8, 8, 8, 9
Mean: (0 + 0 + 0 + 0 + 1 + 2 + 3 + 4 + 4 + 5 + 5 + 5 + 5 + 6 + 7 + 8 + 8 + 8 + 9) / 19
= 100 / 19
≈ 5.26
To find the median, we need to arrange the data in ascending order: 0, 0, 0, 0, 1, 2, 3, 4, 4, 5, 5, 5, 5, 6, 7, 8, 8, 8, 9.
The median is the middle value, which is the 10th value in this case.
Median: 5
For Seaside School:
Data: 0, 0, 0, 1, 1, 2, 2, 4, 5, 5, 5, 5, 6, 7, 7, 8, 8, 8, 9
Mean: (0 + 0 + 0 + 1 + 1 + 2 + 2 + 4 + 5 + 5 + 5 + 5 + 6 + 7 + 7 + 8 + 8 + 8 + 9) / 19
= 80 / 19
≈ 4.21
To find the median, we need to arrange the data in ascending order: 0, 0, 0, 1, 1, 2, 2, 4, 5, 5, 5, 5, 6, 7, 7, 8, 8, 8, 9.
The median is the middle value, which is the 10th value in this case.
Median: 5
Now let's calculate the measures of variability, specifically the range and interquartile range (IQR).
Range: The range is the difference between the largest and smallest values in the dataset.
For Mountain View School:
Range: 9 - 0 = 9
For Seaside School:
Range: 9 - 0 = 9
Interquartile Range (IQR): The IQR is the difference between the third quartile (Q3) and the first quartile (Q1) and measures the spread of the middle 50% of the data.
For Mountain View School:
Q1 = 3
Q3 = 7
IQR = Q3 - Q1 = 7 - 3 = 4
For Seaside School:
Q1 = 2
Q3 = 7
IQR = Q3 - Q1 = 7 - 2 = 5
To determine which school is a better choice for a smaller class size, we can consider both the mean and the median.
Both the mean and median for Mountain View School are higher than those for Seaside School. This suggests that, on average, the class sizes at Mountain View School are larger than those at Seaside School. Therefore, if you are interested in a smaller class size, Seaside School would be a better choice
For Mountain View School:
- Median: The median class size is the middle value, which is 25.
- Mean: The mean class size is the sum of all the class sizes divided by the total number of classes, which is (29 + 28 + 28 + 27 + 25 + 24 + 24 + 23 + 21 + 20 + 19 + 18 + 15 + 13 + 10) / 15 = 21.27.
For Seaside School:
- Median: The median class size is the middle value, which is 20.
- Mean: The mean class size is the sum of all the class sizes divided by the total number of classes, which is (25 + 25 + 27 + 27 + 28 + 28 + 28 + 30 + 31 + 35 + 36 + 38 + 40 + 43 + 45) / 15 = 31.13.
Part B:
For Mountain View School:
- Range: The range is the difference between the largest and smallest values, which is 29 - 10 = 19.
- Interquartile Range (IQR): The IQR is the difference between the third quartile (Q3) and the first quartile (Q1). From the stem-and-leaf plot, we can see that Q1 is 20 and Q3 is 28. Therefore, the IQR is 28 - 20 = 8.
For Seaside School:
- Range: The range is the difference between the largest and smallest values, which is 45 - 25 = 20.
- Interquartile Range (IQR): The IQR is the difference between the third quartile (Q3) and the first quartile (Q1). From the stem-and-leaf plot, we can see that Q1 is 27 and Q3 is 38. Therefore, the IQR is 38 - 27 = 11.
Part C:
If you are interested in a smaller class size, Mountain View School is a better choice for you because it has a lower mean and median class size than Seaside School.
What equation can be used to find the distance rate and time of any situation?
Answers
Answer:
d=rt
Step-by-step explanation:
distance = rate ⋅ time
Answer:
distance=rate×timed=rt
Step-by-step explanation:
For example, if your rate is 60 mph and you drive for 3 hours, you will have driven 60×3=180 miles
5/6 but if i mulsiply by 4 it gives me whole diff
Answers
Answer:
3.33 or 3 1/3
Step-by-step explanation:
You're correct to multiply by 4.
Your answer will be 10/3
Just make it a mixed number: 3 1/3
3.33 is 10/3 as a decimal.
Keep it, Change it, Flip it: 5 & 6/11 ÷ 13/17
a. 5 & 6/11 ÷ 13/17
b. 5 & 6/11 x 17/13
c. 5 & 6/11 ÷ 17/13
d. 5 & 6/11 x 13/17
Answers
Answer:
pretty sure its C. hope i helped
Answer:
B.
Step-by-step explanation:
When dividing fractions, use the KCF method or Keep it, Change it, Flip it.
1. Keep the first fraction.
2. Change the division sign to multiplication.
3. Flip the fraction, and use the reciprocal instead (in this case, 13/17 would become 17/13).
The correct answer would be b. 5 & 6/11 x 17/13
(6.4 × 103) ÷ (3.2 × 102)
Express your answer in scientific notation.
A.2 × 101
B.2 × 102
C.2 × 105
D.2 × 106
Answers
Step-by-step explanation:
step 1. 6.4 x 103 = 659.2
step 2. 3.2 x 102 = 326.4
step 3.
\(659.2 \times 326.4= 2.01960784314\)
step 4. 2.01960784314 = 2.01960784314 x 10 ^ 0 or 2.01960784314 x 1
i hope this helps sorry i could not give the exact answer you were looking for = ) <3
PLEASE HELP NEED THE ANSWER ASAP!!
+100 POINTS AND BRAINLIEST!!
Answers
Which of the following are accurate descriptions of the distribution below?
Answers
Answer:
the most years of experience is 2, and the least years are 10 years
Step-by-step explanation:
A can of soup has a height of 5 in and a diameter of 4 in. Find the area of the label around the soup can.
Answers
Answer:
87.96
Step-by-step explanation:
A= 2πrh+2πr^2
A= 2π(2)(5)+2π(2^2)
A= 87.96