(q5) Which of the following is the area of the surface obtained by rotating the curve
, about the x-axis?
Answers
The given curve is y = x³ − 2x and it has to be rotated about the x-axis to find the area of the surface. The formula to find the surface area of a curve obtained by rotating about the x-axis is given by:$$
A = 2\pi \int_a^b y \sqrt{1 + \left(\frac{dy}{dx}\right)^2} dx
$$Differentiating the curve with respect to x, we get:$$
y = x^3 - 2x
$$$$
\frac{dy}{dx} = 3x^2 - 2$$Now, squaring it, we get:$$
\left(\frac{dy}{dx}\right)^2 = 9x^4 - 12x^2 + 4$$$$
1 + \left(\frac{dy}{dx}\right)^2 = 1 + 9x^4 - 12x^2 + 4$$$$
= 9x^4 - 12x^2 + 5$$Putting the values in the formula, we get:$$
A = 2\pi \int_a^b y \sqrt{1 + \left(\frac{dy}{dx}\right)^2} dx$$$$
= 2\pi \int_{-1}^2 (x^3 - 2x) \sqrt{9x^4 - 12x^2 + 5} dx$$Simplifying it further, we get:$$
A = 2\pi \int_{-1}^2 (x^3 - 2x) \sqrt{(3x^2 - 1)^2 + 4} dx$$$$
= 2\pi \int_{-1}^2 (x^3 - 2x) \sqrt{9x^4 - 6x^2 + 5} dx$$Now, substituting $9x^4 - 6x^2 + 5 = t^2$, we get:$$(18x^3 - 12x)dx = tdt$$$$
(3x^2 - 2)dx = \frac{tdt}{3}$$When $x = -1$, $t = \sqrt{20}$ and when $x = 2$, $t = 5\sqrt{5}$Substituting the values in the formula, we get:$$
A = 2\pi \int_{\sqrt{20}}^{5\sqrt{5}} \frac{t^2}{27} dt$$$$
= \frac{28\pi}{27} \left[ t^3 \right]_{\sqrt{20}}^{5\sqrt{5}}$$$$
= \frac{28\pi}{27} \left[ 125\sqrt{5} - 20\sqrt{20} - 5\sqrt{5} + 2\sqrt{20} \right]$$$$
= \frac{28\pi}{27} \left[ 120\sqrt{5} - 18\sqrt{20} \right]$$$$
= \frac{56\pi}{27} \left[ 30\sqrt{5} - 9\sqrt{20} \right]$$$$
= \frac{56\pi}{27} \left[ 30\sqrt{5} - 18\sqrt{5} \right]$$$$
= \frac{56\pi}{27} \cdot 12\sqrt{5}$$$$
= \boxed{224\sqrt{5}\pi/3}$$Therefore, the area of the surface obtained by rotating the curve $y = x^3 - 2x$ about the x-axis is $\boxed{224\sqrt{5}\pi/3}$.
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The total area of the regions between the curves is 1.134π square units
Calculating the total area of the regions between the curvesFrom the question, we have the following parameters that can be used in our computation:
x = ∛y
We have the interval to be
0 ≤ y ≤ 1
The area of the regions between the curves is then calculated using
[tex]A =2\pi \int\limits^a_b {f(x) * \sqrt{1 + (dy/dx)^2} } \, dx[/tex]
From x = ∛y, we have
y = x³
Differentiate
dy/dx = 3x²
So, the area becomes
[tex]A =2\pi \int\limits^1_0 {x^3 * \sqrt{1 + (3x^2)^2} } \, dx[/tex]
Expand
[tex]A =2\pi \int\limits^1_0 {x^3 * \sqrt{1 + 9x^4 } \, dx[/tex]
Integrate
[tex]A =2\pi \frac{(9x^4 + 1)^{\frac{3}{2}}}{54}|\limits^1_0[/tex]
Expand
[tex]A = 2\pi [\frac{(9(1)^4 + 1)^{\frac{3}{2}}}{54} - \frac{(9(0)^4 + 1)^{\frac{3}{2}}}{54}][/tex]
This gives
A = 2π * 0.5671
Evaluate the products
A = 1.1342π
Approximate
A = 1.134π
Hence, the total area of the regions between the curves is 1.134π square units
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Related Questions
A social psychologist wants to assess whether there are geographical differences in how much people complain. The investigator gets a sample of 20 people who live in the Northeast and 20 people who live on the West Coast and asks them to estimate how many times they have complained in the past month. The mean estimated number of complaints from people living on the West Coast was 9.5, with a standard deviation of 2.8. The mean estimated number of complaints that people in the Northeast reported making was 15.5, with a standard deviation of 3.8. What can the researcher conclude? Use alpha of .05.
Answers
The researcher can conclude that there is a statistically significant difference in the mean number of complaints between people living on the West Coast and those living in the Northeast.
To determine if there are geographical differences in how much people complain between the Northeast and the West Coast, we can conduct a hypothesis test.
Null hypothesis (H0): There is no difference in the mean number of complaints between the Northeast and the West Coast.
Alternative hypothesis (H1): There is a difference in the mean number of complaints between the Northeast and the West Coast.
Given the sample statistics, we can perform a two-sample independent t-test to compare the means of the two groups.
Let's calculate the test statistic and compare it to the critical value at a significance level of α = 0.05.
The West Coast sample has a mean (x1) of 9.5 and a standard deviation (s1) of 2.8, with a sample size (n1) of 20.
The Northeast sample has a mean (x2) of 15.5 and a standard deviation (s2) of 3.8, with a sample size (n2) of 20.
Using the formula for the pooled standard deviation (sp), we can calculate the test statistic (t):
sp = sqrt(((n1 - 1) * s1^2 + (n2 - 1) * s2^2) / (n1 + n2 - 2))
t = (x1 - x2) / (sp * sqrt(1/n1 + 1/n2))
Calculating the test statistic:
sp = sqrt(((19 * 2.8^2) + (19 * 3.8^2)) / (20 + 20 - 2)) ≈ 3.273
t = (9.5 - 15.5) / (3.273 * sqrt(1/20 + 1/20)) ≈ -4.63
Using a t-table or a statistical calculator, we can find the critical value for a two-tailed t-test with α = 0.05 and degrees of freedom (df) = n1 + n2 - 2 = 38. The critical value is approximately ±2.024.
Since the absolute value of the test statistic (4.63) is greater than the critical value (2.024), we reject the null hypothesis.
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HELP ASAP PLEASE ILL MARK BRAINLIEST AND RATE 5 STARS PLEASEEE
A survey about the student government program at a school finds the following results:
190 students like the program
135 students think the program is unnecessary
220 students plan on running for student government next year.
If a circle graph were made from this data, what would the measure of the central angle be for the group that likes the program? Round your answer to the nearest whole number. Make Sure To Show Your Steps
Answers
Answer: 126 degrees
there are 360 degrees in a circle.
A survey of 879 supermarket employees revealed that 239 workers felt they were overqualified for the position. What is the best way to characterize the 879 employees?
Answers
Answer:
they doubt if they're qualified or not
Find the value of x. Round to the
nearest tenth.
12
Х
2597
X = ?
Enter
Answers
Answer:
x ≈ 5.1
Step-by-step explanation:
Using the sine ratio in the right triangle
sin25° = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{x}{12}[/tex] ( multiply both sides by 12 )
12 × sin25° = x , that is
x≈ 5.1 ( to the nearest tenth )
Examine the number pattern below. 1,203, 1,624, 2,045, 2,466 ... What rule does this pattern follow? Write the next three numbers in the pattern. If the pattem continues, what will the 10 number in the sequence be? Examine the number pattern below. 10,000, 9,899, 9,798, 9,697 ... What rule does this pattern folow? Write the next three numbers in the pattern if the patter continues, what will the 11" number in the sequence be? 3. Examine the number pattern below. 5,554, 5,274, 4,994, 4.714 ... What rule does this pattern follow? Write the next three numbers in the pattern. It the patter continues, what will the 12 number in the sequence be?
Answers
1. Next three numbers: 2,887, 3,308, 3,729. Tenth number: 5,905.
2. Next three numbers: 9,596, 9,495, 9,394. Eleventh number: 9,293.
3. Next three numbers: 4.434, 4.154, 3.874. Twelfth number: 3.594.
How to continue these number patterns?Let's examine each number pattern one by one:
1. Pattern: 1,203, 1,624, 2,045, 2,466 ...
Rule: Each number in the pattern is obtained by adding 421 to the previous number.
Next three numbers: 2,887, 3,308, 3,729
Tenth number: 5,905
2. Pattern: 10,000, 9,899, 9,798, 9,697 ...
Rule: Each number in the pattern is obtained by subtracting 101 from the previous number.
Next three numbers: 9,596, 9,495, 9,394
Eleventh number: 9,293
3. Pattern: 5,554, 5,274, 4,994, 4.714 ...
Rule: Each number in the pattern is obtained by subtracting 280 from the previous number.
Next three numbers: 4.434, 4.154, 3.874
Twelfth number: 3.594
Therefore, based on the given patterns, the next three numbers and the specified numbers in the sequences would be as follows:
1. Pattern: 2,887, 3,308, 3,729 ... 5,905 (10th number)
2. Pattern: 9,596, 9,495, 9,394 ... 9,293 (11th number)
3. Pattern: 4.434, 4.154, 3.874 ... 3.594 (12th number)
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A ladder that is 18 ft. long is leaning
against the side of a building. If the angle
formed between the ladder and the ground
is 30°, how far is the bottom of the ladder
from the base of the building?
Answers
hope this helps!
Choose the equation and the slope of the line that passes through (5, -3) and is perpendicular to the x-axis. A. Equation: x= -3 B. Slope: undefined C. Slope: 0 D. Equation: y = -3 E. Equation: x = 5 E Equation: y = 5
Answers
I know this because I just did it on a piece of paper
The radius of a circle is 4 feet. What is the area?
r=4ft
Give the exact answer in simplest form.
Answers
100.571429
2. A circular patio has a diameter of 18 feet. How
many square feet of tile will it take to cover the
patio?
Answers
Answer: So to cover the patio it would take 255 whole tiles. 254.469 if you want to be exact.
Step-by-step explanation:
When finding flooring needed we are finding for area. We know the formula for finding the area of a circle is A=[tex]\pi r^{2}[/tex] so we plug in our known variables...
we know r because radius is half of diameter and diameter was given in problem. So half of 18 is 9.
r=9
A=[tex]\pi 9^{2}[/tex]
A=[tex]\pi[/tex]81
A=254.469
-48+6
+(-3)(-4) (-2)
-7
Answers
Answer:
-73
Step-by-step explanation:
-48+6-24-7 = -73
which of the following segments is a diameter of 0?
Answers
Answer:
ZX
Step-by-step explanation:
Solve for .
Reduce any fractions to lowest terms. Don't round your answer, and don't use mixed fractions.
43 +4 < 92 +8
Answers
Answer:
[tex]x > -\frac{24}{19}[/tex]
Step-by-step explanation:
Given
[tex]\frac{4}{3}x + 4 < \frac{9}{2}x + 8[/tex]
Required
Solve for x
Collect like terms
[tex]\frac{4}{3}x - \frac{9}{2}x < 8-4[/tex]
[tex]\frac{4}{3}x - \frac{9}{2}x < 4[/tex]
Take LCM
[tex]\frac{8x - 27x}{6} < 4[/tex]
[tex]\frac{-19x}{6} < 4[/tex]
Multiply by 6
[tex]6 * \frac{-19x}{6} < 4 * 6[/tex]
[tex]-19x < 24[/tex]
Divide by -19
[tex]x > -\frac{24}{19}[/tex]
The shaded sector above covers 1/3 of the circle. If the radius of the circle above is 3 cm, what is the area of the sector in terms of ?
Answers
Given:
The shaded sector above covers [tex]\dfrac{1}{3}[/tex] of the circle.
Radius of the circle = 3 cm
To find:
The area of the sector in terms of π.
Solution:
The area of a circle is
[tex]A=\pi r^2[/tex]
Substituting [tex]r=3[/tex], we get
[tex]A=\pi (3)^2[/tex]
[tex]A=9\pi[/tex]
It is given that the shaded sector above covers [tex]\dfrac{1}{3}[/tex] of the circle.
The area of shaded sector [tex]=\dfrac{1}{3}A[/tex]
[tex]=\dfrac{1}{3}(9\pi)[/tex]
[tex]=3\pi[/tex]
Therefore, the area of shaded sector is 3π sq. cm.
The price of a cup of coffee was $2.10 yesterday. Today, the price rose to $2.45. Find the percentage increase. Round your answer to the nearest tenth of a
percent.
Answers
Answer:
16.6667% increase
Step-by-step explanation:
Percentage Increase=Final Value−Starting Value|Starting Value|×100
Answer:
17%
Step-by-step explanation:
The increase is calculated as the difference between yesterday's price and today's price, hence $2.45 - $2.10 = $0.35
As a fraction of yesterday's price, the fraction is [tex]\frac{0.35}{2.10}[/tex], which reduces to [tex]\frac{1}{6}[/tex]. Expressed as a decimal fraction, this is 0.16... Shift the decimal point two places to the right to get the percentage increase of 16.6...%.
Since it said to round to the nearest tenth, rounding it makes the answer of 17.0% or 17% because since 6 is bigger than 10, we needed to round up and thus the answer is 17%.
True or False The sample variance may not be always greater than the sample standard deviation
Answers
This statement is false because the sample variance is always greater than or equal to the sample standard deviation.
Variance and standard deviation are both measures of variability or dispersion within a dataset. The sample variance is defined as the average of the squared differences between each data point and the mean of the dataset. On the other hand, the sample standard deviation is the square root of the variance.
Since variance involves squaring the differences, it accounts for the spread of the dataset more effectively than the standard deviation. As a result, the sample variance tends to be larger than or equal to the sample standard deviation.
Mathematically, this relationship can be expressed as follows:
Sample Variance = [tex]\[\frac{{\sum_{i=1}^{n} (x_i - \overline{x})^2}}{{n - 1}}\][/tex]
Sample Standard Deviation = [tex]\[\sqrt{\frac{{\sum_{i=1}^{n} (x_i - \overline{x})^2}}{{n - 1}}}\][/tex]
Where x represents each data point, [tex]\(\overline{x}\)[/tex] represents the mean, and n is the sample size.
Therefore, it is not possible for the sample variance to be smaller than the sample standard deviation.
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2. kiran is flying a kite. he gets tired, so he stakes the kite into the ground. the kite is on a string that is 18 feet long and makes a 30 degree angle with the ground. how high is the kite?
a. 9√3 feet
b. 9 feet
c. 18/√2 feet
d. 18/√3 feet
Answers
If kite is on a string that is 18 feet long, then the height of kite is (b) 9 feet.
In order to find the height of the kite, we use trigonometry. We know that the length of the string is 18 feet and the angle with the ground is 30 degrees, we use the Sine function to determine the height of the kite.
The formula to find the height is:
Height = (Length of string) × Sin(Angle),
Substituting the values,
We get,
Height = (18 feet) × Sin(30 degrees),
Using the value of Sine of 30 degrees as (0.5), we can calculate the height as :
Height = (18 feet) × (0.5),
= 9 feet
Therefore, the correct option is (b) 9 feet.
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Plz help is it the same?
Answers
Answer:
12.054 < 12.54
Step-by-step explanation:
12.054 is less than 12.54 because it has a zero in the tenths place, and 12.54 has a five in the tenths place! Always check the first spot after the decimal first. Best of luck<3
Answer:
12.054 < 12.54
Step-by-step explanation:
Please help me find the value of x for this trig question
Answers
Answer:
11.330
Step-by-step explanation:
Answer:
x=11.3
Step-by-step explanation:
Hello There!
We can use trigonometry to solve for x
Remember these are the trigonometric ratios
SOHCAHTOA
Sin = Opposite over Hypotenuse
Cos = Adjacent over Hypotenuse
Tan = Opposite over Adjacent
We can use the angle that has a measure of 31 degrees
We are given the hypotenuse and we need to find its opposite side
hypotenuse and opposite corresponds with sine so we will use sine to create an equation
(remember sin = opposite over hypotenuse)
[tex]sin(31)=\frac{x}{22}[/tex]
now that we have created an equation we solve for x
step 1 multiply each side by 22
[tex]sin(31)*22=22sin(31)\\\frac{x}{22} *22=x\\x=22sin(31)\\sin(31)=0.5150380749\\0.5150380749*22=11.33083765\\x =11.33083765[/tex]
finally we round to the nearest tenth and get that x = 11.3
The speed of light is 3 × 108 meters per second. It take 1.82 × 102 seconds for light to reach Mars. What is the distance, in meters, between the sun and Mars? A 4.82 x 1016 B 4.82 x 1010 C 5.46 x 1016 D 5.46 x 1010
Answers
Answer:
D 5.46 x 10^10
Step-by-step explanation:
Recall that speed is the rate of change of distance with time and may be expressed mathematically as
speed = Distance/time
Distance = speed * time
Hence given that the speed of light
= 3 × 10^8 meters per second
Time taken for light to travel between the given distance
= 1.82 × 10^2 seconds
substituting the given values
Distance = 3 × 10^8 * 1.82 × 10^2
= 5.46 * 10^(8+2)
= 5.46 * 10^10 meters
How to multiply fractions
Answers
Answer:
Answer Below:
Step-by-step explanation:
The first step when multiplying fractions is to multiply the two numerators. The second step is to multiply the two denominators. Finally, simplify the new fractions. The fractions can also be simplified before multiplying by factoring out common factors in the numerator and denominator.
sooooooooo
technically i've neevr lost a fight with a tiger
Answers
Answer:
oh thats cool
Step-by-step explanation:
Find the area of the shaded sector below.
Answers
Answer:
9.07571212
Step-by-step explanation:
To solve this we first need to find the area of the circle, r squared times pi
4 x 4 x pi = 50.2654825
Now we multiply this by 65/360, 50.2654825 x 65/360 = 9.07571212
The shaded sector covers 9.07571212 square inches.
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In an independent-measures experiment with three treatment conditions has a sample of n = 10 scores in each treatment. If all three treatments have the same total. T1 T2 T3, what is SSbetween?
a. 0
b. 100
c. 10(3)
d. This cannot be determined from the information given.
Answers
The value obtained for SSbetween is 20. The correct answer is (b) 20.
To calculate the sum of squares between (SSbetween) for an analysis of variance (ANOVA), we need to determine the variation between the sample means of the different treatment conditions. The formula for SSbetween is as follows:
SSbetween = n * Σ(M - m)²
where n is the sample size for each treatment condition, M is the individual treatment condition mean, and m is the overall mean.
In this case, the sample size for each treatment condition is n = 10, and the treatment condition means are M1 = 1, M2 = 2, and M3 = 3.
To calculate SSbetween, we first find the overall mean (m) by taking the average of the treatment condition means:
m = (M1 + M2 + M3) / 3
m = (1 + 2 + 3) / 3
m = 6 / 3
m = 2
Now, we can calculate SSbetween:
SSbetween = n * Σ(M - m)²
SSbetween = 10 * [(1 - 2)² + (2 - 2)² + (3 - 2)²]
SSbetween = 10 * [(-1)² + (0)² + (1)²]
SSbetween = 10 * (1 + 0 + 1)
SSbetween = 10 * 2
SSbetween = 20
Therefore, the value obtained for SSbetween is 20. The correct answer is (b) 20.
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Incomplete question:
An independent-measures research study compares three treatment conditions using a sample of n = 10 in each treatment. For this study, the three sample means are M1 = 1, M2 = 2, and M3 = 3. For the ANOVA, what value would be obtained for SSbetween?
a.30
b.20
c.10
d. 2
Which expression is equivalent to 4n(6n + 2m)?
A 24n + 4n + 2m
B (4n + 2m) x 6n
C 24n2 + 8mn
D 10n2 + 6mn
Answers
Answer:
c maybe
Step-by-step explanation:
4n(6n+2m)
24n²+8mn
Answer: C, 24n²+8mn
Step-by-step explanation:
So because 4n is on the outside of the bracket, you have to times everything on the inside of the bracket by 4n.
So, you do:
4n×6n=24n² (4×6=24 and n×n=n²)
4n×2m=8mn (4×2=8 and n×m=mn)
Then you add 24n² to 8mn like this:
24n²+8mn
Hope this helps :)
Erin has 5/4 quarts of paint and she needs 2/8 of paint for each stair-step and how much paint can Erin exactly paint
Answers
Answer:
5 steps
Step-by-step explanation:
Turn 5/4s into 10/8s and it becomes really easy
The number of steps Erin could paint if he has 5/4 parts of paint, and she needs 2/8 of paint for each stair step, is 5.
What is division?It is a basic operation of mathematics in which you divide a number into smaller parts.
Given:
Erin has 5/4 quarts of paint,
2/8 of paint for each stair-step,
Calculate the number of steps painted as shown below,
Number of steps = total paint / paint required for each step
Number of steps = 5/4 / 2/8
Number of steps =
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Experimental Probability is ___________ .
a . our prediction
b. data from our experiment
Answers
Answer:
its B
Step-by-step explanation:
Answer:
b. data from our experiment
Step-by-step explanation:
"Let C be a semialgebra on a set X. Let A = {0} U {U}=1 A; : n E N, {A1, ... , An} C C, disjoint}. = : In other words, A consists of the empty set and all finite, disjoint unions of sets in C. Prove that A is an algebra on X.
"
Answers
The set A, defined as A = {∅} ∪ {⋃_{i=1}^n Ai : n ∈ ℕ, {Ai} ⊆ C, disjoint}, is proven to be an algebra on a set X.
To prove that A is an algebra, we need to show that it satisfies three conditions: (1) X ∈ A, (2) for any set A ∈ A, its complement X\A also belongs to A, and (3) for any sets A, B ∈ A, their union A ∪ B also belongs to A.
First, the empty set ∅ is included in A by definition. Second, let A be any set in A, represented as A = ⋃_{i=1}^n Ai, where {Ai} is a collection of disjoint sets from C. Then, the complement of A is X\A, which can be represented as X\A = ⋃_{i=1}^n (X\Ai). Since each Ai is in C, their complements X\Ai are also in C, implying X\A is a disjoint union of sets from C and therefore belongs to A.
Lastly, let A and B be two sets in A, represented as A = ⋃_{i=1}^n Ai and B = ⋃_{j=1}^m Bj. The union of A and B is A ∪ B = ⋃_{i=1}^n Ai ∪ ⋃_{j=1}^m Bj. Since Ai and Bj are disjoint sets from C, their union Ai ∪ Bj is also in C. Thus, A ∪ B is a disjoint union of sets from C and belongs to A.
By satisfying all three conditions, A is proven to be an algebra on X.
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If
y=∑n=0[infinity]cnxny=∑n=0[infinity]cnxn
is a solution of the differential equation
y′′+(3x−1)y′−1y=0,y″+(3x−1)y′−1y=0,
then its coefficients cncn are related by the equation
cn+2=cn+2= cn+1cn+1 + cncn .
Answers
The coefficients cn are related by the equation:
cn+2 = (n+1)(n+2)cn+1 + (3n-1)cn
To begin, we can substitute the expression for y into the differential equation and see if it satisfies the equation. Taking the first and second derivatives of y with respect to x, we find:
y' = ∑n=0[infinity]cnxn-1
y'' = ∑n=0[infinity]cn(n-1)xn-2
Substituting these expressions into the differential equation yields:
∑n=0[infinity]cn(n-1)xn-2 + (3x-1)∑n
=> 0[infinity]cnxn-1 - ∑n=0[infinity]cnxn+1 = 0
We can rearrange this equation to get:
∑n=0[infinity]cn(n+2)xn+1
=> ∑n=0[infinity]cn(n-1)xn-2 + (3x-1)∑n=0[infinity]cnxn
Now, we can compare the coefficients of xn+1 on both sides of the equation to get:
cn+2 = (n+1)(n+2)cn+1 + (3n-1)cn
This is a recurrence relation for the coefficients cn. To see how it relates to the equation given in the question, we can substitute n+1 for n and simplify:
cn+3 = (n+2)(n+3)cn+2 + (3n+2)cn+1
Now we can substitute cn+1 from the original recurrence relation:
cn+3 = (n+2)(n+3)(n+1)cn+1 + (n+2)(n+3)cn + (3n+2)cn+1
Simplifying gives:
cn+3 = (n+2)(n+3)cn+2 + [(n+2)(n+3)(n+1) + 3n+2]cn+1
This is exactly the same recurrence relation as the one given in the question. Therefore, we can conclude that the coefficients cn are related by the equation:
cn+2 = (n+1)(n+2)cn+1 + (3n-1)cn
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Help me with the please
Answers
Answer:
32 degrees.
Step-by-step explanation:
(Please help im desperate)
3. What is the perimeter of the figure graphed below?