Consecutive terms in the α sequence have a common difference of
8 - 10 = 6 - 8 = 4 - 6 = … = -2
so they are given recursively by
[tex]\begin{cases} \alpha_1 = 10 \\ \alpha_n = \alpha_{n-1} - 2 & \text{for } n\ge2 \end{cases}[/tex]
By substitution, we have
[tex]\alpha_n = \alpha_{n-1} - 2 \\\\ \alpha_n = \alpha_{n-2} - 2\cdot2 \\\\ \alpha_n = \alpha_{n-3} - 3\cdot2 \\\\ \vdots \\\\ \alpha_n = \alpha_{n-(n-1)} - (n-1)\cdot 2 = \alpha_1 - 2(n-1) = 12-2n[/tex]
Consecutive terms in the β sequence have a common ratio of
6/9 = 4/6 = (8/3)/4 = … = 2/3
so the recurrence for these terms is
[tex]\begin{cases} \beta_1 = 9 \\\\ \beta_n = \frac23 \beta_{n-1} & \text{for } n\ge2 \end{cases}[/tex]
We can solve for [tex]\beta_n[/tex] similarly:
[tex]\beta_n = \dfrac23 \beta_{n-1} \\\\ \beta_n = \left(\dfrac23\right)^2 \beta_{n-2} \\\\ \beta_n = \left(\dfrac23\right)^3 \beta_{n-3} \\\\ \vdots \\\\ \beta_n = \left(\dfrac23\right)^{n-1} \beta_{n-(n-1)} = \left(\dfrac23\right)^{n-1} \beta_1 = \dfrac{2^{n-1}}{3^{n-1}} \cdot 3^2 = \dfrac{2^{n-1}}{3^{n-3}}[/tex]
The γ sequence has [tex]n[/tex]-th term
[tex]\gamma_n = \alpha_n \beta_n = (12-2n) \dfrac{2^{n-1}}{3^{n-3}} = (108-18n) \left(\dfrac23\right)^{n-1}[/tex]
and we want to compute
[tex]\displaystyle \sum_{n=1}^\infty \gamma_n = 108 \sum_{n=1}^\infty \left(\frac23\right)^{n-1} - 18 \sum_{n=1}^\infty n \left(\frac23\right)^{n-1}[/tex]
Recall the sum of an infinite geometric series with common ratio [tex]|r|<1[/tex] converges to
[tex]\displaystyle \sum_{n=1}^\infty r^{n-1} = \frac1{1-r}[/tex]
so that
[tex]\displaystyle \sum_{n=1}^\infty \left(\frac23\right)^{n-1} = \frac1{1-\frac23} = 3[/tex]
For the remaining sum, we can use the method shown in question [24494877] to compute
[tex]\displaystyle \sum_{n=1}^\infty nr^{n-1} = \frac1{(1-r)^2}[/tex]
which gives
[tex]\displaystyle \sum_{n=1}^\infty n \left(\frac23\right)^{n-1} = \frac1{\left(1-\frac23\right)^2} = 9[/tex]
Then the infinite sum of the terms of γ converges to
[tex]\displaystyle \sum_{n=1}^\infty \gamma_n = 108 \cdot 3 - 18 \cdot 9 = \boxed{162}[/tex]
What is 1000 x 9.2 ?
what is the distributive property of 24+40
What is the area of a triangle whose vertices are J(−2, 1), K(0, 3), and L(4, −4)?
area of triangle with vertices (x1,y1) ; (x2,y2) and (x3,y3) is
(x1 (y2 - y3 ) + x2 ( y3 - y1 )+ x3 ( y1 - y2))/2
hence, substituting the points (x1, y1)= (-2, 1);
( x2, y2)= (0,3) ; and (x3, y3)= (4,-4) in the area formula ,we get
area of triangle =
( -2(3-(-4)) + 0( -4 - 1) + 4(1-3))/2
(-14+0-8)\2
22\2
11 sq unit
What is the probability of
spinning a yellow?
[?]%
Answer:
12.5
Step-by-step explanation:
there are eight triangles and one yellow so 1/8=12.5%
Answer: 12.5%
Step-by-step explanation:
There are 8 sections and 1 of them is yellow so 1 divided by 8 is 0.125 or 12.5%
Write an expression that represents the total owed for 3 months of cable at a price of c dollars for each month, plus a one-time equipment fee of $25?
2(25) + c
25c + 3
3(c) + 25
3(c + 25)
Answer:
3(c) + 25
Step-by-step explanation:
Write an expression that represents the total owed for 3 months of cable at a price of c dollars for each month, plus a one-time equipment fee of $25?
2(25) + c
25c + 3
3(c) + 25
3(c + 25)
i have been working to become a major in math and i need some help with what this second word might be for this problem from last weeks exam
Write the following ratio using two other notations. 7/3 use only the numbers above
notation one: ?
notation two: ?
7/3 in notation one can be written as 7 : 3 and 7/3 in notation two can be written as 0.7 and 0.3.
What is a ratio?The ratio is a comparison between two similar quantities in the simplest fraction form. We can write ratios in fractions and in decimals also.
We know we can write a : b as a/b in fraction form and a/(a+b) and b/(a+b) in decimal form.
∴ 7/3 in decimal form can be written as 7 : 3 and 7/3 can also be written as 7/(7+3) = 7/10 = 0.7 and 3/(7+3) = 3/10 = 0.3.
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Find the value of angle A in the triangle below:
angle A =
A
B
95°
55
PLEASE HURRY
A driver travels 55km in 1 hour. He then drives at a speed of 35 km/h for 2 hours. Next, he drive 175km in 3 hours. What was his average speed
Answer:
108.333 km/hour
Step-by-step explanation:
See attached worksheet.
Please simplify this equation and find what y is
Answer: y=7
Step-by-step explanation:
We need to combine like factors in this term by adding up all the exponents and copying the base.
No exponent implies the value of 1.
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Answer:
y =7
Step-by-step explanation:
One factor of the function f(x) = x3 − 9x2 + 20x − 12 is (x − 6). Describe how to find the x-intercepts and the y-intercept of the graph of f(x) without using technology. Show your work and include all intercepts in your answer.
For the given function f(x), x-intercepts are 1,2 and 6 and the y-intercept is -12
Given :
[tex]f(x) = x^{3} -9x^{2} +20x -12 \\[/tex]
One of the factors of f(x) is (x-6)
Dividing f(x) by (x-6), we get :
[tex]\frac{x^{3} -9x^{2} +20x -12 \\}{x-6} = x^{2} -3x +2[/tex]
Now expanding, [tex]x^{2} -3x +2[/tex]
[tex]x^{2} -3x +2 = x^{2} -2x -x +2 =x(x-2) -(x-2) = (x-2)(x-1)[/tex]
Hence, [tex]x^{3} -9x^{2} +20x -12 = (x-6)(x-1)(x-2)[/tex]
For x-intercept, f(x) = 0 . Then
(x-6)(x-1)(x-2) =0
x = 1,2 and 6
For y-intercept, x=0 in f(x)
f(0) = -12
Hence, the x-intercepts are 1,2, and 6 and the y-intercept is -12.
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Expand and simplify (x -5)(x- 4).
Answer: x^2-9x+20
Step-by-step explanation: you have to distribute (x-5) (x-4)
which would be x^2-4x -5x +20 when you simplify that you get x^2-9x+20
100%− 9/10 equals what
Answer: 100%-9/10= -0.8
Step-by-step explanation:
100%-9=-8
-8/10=-0.8
Custard is heated to a temperature of 180°F. It is then allowed to cool in a refrigerator whose temperature is 30°F. The custard cools to 120°F in 30 minutes. Determine how long will it take for the custard to cool to 50°F.
Answer: About 65 minutes.
It changes an average of about 60 degrees Fahrenheit every half hour.
180 120 60 50
0 30 60 65
Now it is about ten degrees until it's fifty. Since it takes thirty minutes to go down sixty degrees, divide sixty by ten to get six. Then divide thirty by six to get five. So, it should take about 65 minutes to cool down to 50 degrees.
It will take approximately 35 minutes for the custard to cool from 120°F to 50°F.
To determine how long it will take for the custard to cool to 50°F, we need to consider the rate at which it cools. From the given information, we know that the custard cools from 180°F to 120°F in 30 minutes.
To find the rate of cooling, we can calculate the temperature change per minute.
The temperature decreases by 180°F - 120°F = 60°F over 30 minutes. So, the rate of cooling is 60°F / 30 minutes = 2°F per minute. Now, let's use this rate to calculate how long it will take for the custard to cool from 120°F to 50°F.
The temperature difference between 120°F and 50°F is 120°F - 50°F = 70°F. To cool from 120°F to 50°F at a rate of 2°F per minute, it will take 70°F / 2°F per minute = 35 minutes.
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Trigonometry question with show work
a)I WILL USE THE THEOREM OF PYTHAGORAS IN TRIANGLE BCD
[tex] {y}^{2} = {(5.3)}^{2} - {(4.4)}^{2} \\ {y}^{2} = 28.9 - 19.36 \\ {y}^{2} = 9.54 \\ y = \sqrt{9.54} \\ y = 3.09[/tex]
y=3.90cm
b)
[tex] \sin(x) = \frac{cb}{ac} \\ \sin(x) = \frac{5.3}{8.2} \\ x = sin^{ - 1} ( \frac{5.3}{8.2} ) \\ x =40.27[/tex]
x=40,27 cm
GOODLUCK.
16c+4(-5)=220
Just solve
Answer:
15
Step-by-step explanation:
16c+4(-5)=220
16c-20=220
16c=240
C=15
What is the missing height?
Answer:
h = 6.36619772 cm
Step-by-step explanation:
h = (3 * v) / (πr2)
Answer:
h = 20 cm
Step-by-step explanation:
the volume (V) of a cone is calculated as
V = [tex]\frac{1}{3}[/tex] πr²h ( where r is the radius )
given r = 9 and V = 540π , then
[tex]\frac{1}{3}[/tex] π × 9² × h = 540π
[tex]\frac{1}{3}[/tex] × π × 81h = 540π
27πh = 540π ( divide both sides by 27π )
h = [tex]\frac{540\pi }{27\pi }[/tex] = 20 cm
Ava took a taxi from her house to the airport. The taxi company charged a pick-up fee
of $1.10 plus $3.75 per mile. The total fare was $19.85, not including the tip. Which
tape diagram could be used to represent the context if a represents the number of
miles in the taxi ride?
A
B
1.1
3.75
1.1
1.1X
3.75
19.85
1.1
19.85
3.75...
3-75
1.1
Using a linear function, it is found that her taxi ride was of 5 miles.
What is a linear function?A linear function, in slope-intercept format, is modeled according to the following rule:
y = mx + b
In which the coefficients are described as follows:
The coefficient m is the slope of the function, which is the rate of change of the function, that is, the change in y divided by the change in x.The coefficient b is the y-intercept of the function, which is the the value of y when the function crosses the y-axis(x = 0).For the cost function, we have that:
The slope is the cost per mile, hence m = 3.75.The intercept is the flat fee, hence b = 1.10.Thus the cost for a ride of x miles is of:
C(x) = 3.75x + 1.10.
Her total fee was of $19.85, hence the mileage is found as follows:
19.85 = 3.75x + 1.10
x = (19.85 - 1.10)/3.75
x = 5 miles.
Which was the length of her taxi ride.
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Solve the equation.
-3x + 1 + 10x = x + 4
HN
0 x = -1/
5/6
0 x = 2/1/2
O x = 12
O x = 18
Value of x for equation -3x + 1 + 10x = x + 4 is 1÷2.
Given equation,
-3x + 1 + 10x = x + 4
Shifting the variables to the left-hand side and constant to the right-hand side,
-3x - x + 10x = 4 - 1
Simplifying the equation,
10x - 4x = 3
6x = 3
x = 1÷2
When x from the right side shifts to the left side, its sign changes, and similarly, when 1 from the left side shifts to the right side, its sign changes.
x = 0.5
Therefore, value of x = 1÷2 that is 0.5
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#10 Eastern Mountain Sports is offering 20%
off of your entire purchase. You have an
online code that will give you an additional
10% off of the sale price(s). You decide to
buy a Kayak, a seat, and a paddle. How
much will you pay after receiving the
discount and using your online code?
EASTERN MOUNTAIN SPORTS
PELICAN Summit Kayak $299.99
BB Adjustable Paddle $191.96
YAK GEAR Kayak Seat $99.99
Answer: $426.20
Step-by-step explanation:
The subtotal is [tex]299.99+191.96+99.99=\$ 591.94[/tex].
[tex](591.94)(0.8)=\$473.552\\\\(473.552)(0.9) \approx \$426.20[/tex]
What is the difference between a union and an intersection in math?Select one:a. The union of two sets contains only the elements that are in both sets. The intersection of two sets all the elements contained in either set (or both sets).b. The union of two sets contains all the elements contained in either set (or both sets). The intersection of two sets contains only the elements that are in both setsc. The union and intersection are exactly the same.
The union of two sets contains all the elements contained in either set (or both sets). The intersection of two sets contains only the elements that are in both sets
Therefore the answer is B.
Help for trigonometry class please
The most appropriate choice for matrix and multiplicative inverse of matrix will be given by
B is the multiplicative inverse of A
What is a matrix and multiplicative inverse of matrix?
Matrix is a rectangular representation of numbers or symbols arranged in the form of rows and column. Matrix is a very important tool in mathematics.
To learn about multiplicative inverse, it is important to know about identity matrix
[tex]\begin{bmatrix} 1 & 0 \\ 0 & 1\end{bmatrix}[/tex] is a 2 x 2 identity matrix denoted by I.
Let A and B be two matrices
A is said to be a multiplicative inverse of B if AB = BA = I
Here,
A= [tex]\begin{bmatrix} 2& 1\\1 & 1\end{bmatrix}[/tex] B = [tex]\begin{bmatrix} 1& -1\\-1 & 2\end{bmatrix}[/tex]
AB =
[tex]\begin{bmatrix} 2& 1\\1 & 1\end{bmatrix}\begin{bmatrix} 1& -1\\-1 & 2\end{bmatrix}[/tex]
[tex]\begin{bmatrix} 2\times 1 + 1 \times -1& 2 \times -1 + 1\times 2\\1 \times 1+1\times-1 & 1 \times -1 + 1 \times 2\end{bmatrix}\\\begin{bmatrix} 1& 0\\0&1\end{bmatrix}\\[/tex]
BA =
[tex]\begin{bmatrix} 1& -1\\-1 & 2\end{bmatrix}\begin{bmatrix} 2& 1\\1 & 1\end{bmatrix}[/tex]
[tex]\begin{bmatrix} 1\times 2 + -1 \times 1& 1 \times 1 + -1\times 1\\-1 \times 2+2\times 1 & -1 \times 1+ 2 \times 1\end{bmatrix}\\\begin{bmatrix} 1& 0\\0&1\end{bmatrix}\\[/tex]
AB = BA = [tex]\begin{bmatrix} 1& 0\\0&1\end{bmatrix}\\[/tex]
So B is the multiplicative inverse of A
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Use the Segment Addition Postulate to find the unknown variables/lengths:
X, Y, and Z are collinear. If Y is between X and Z, XY = (5x-5) feet, YZ = (3x + 3) feet, and XZ = (3x + 8) feet, then x =
feet.
feet, and XZ =
Blank 1:
Blank 2:
Blank 3
PLEASE HURRY
Graph the image of the figure using the transformation given.
Answer:
D
Step-by-step explanation:
Is the expression −9×(−9)−9 equivalent to [−9×(−9)]−9? Explain.
Using BODMAS we can conclude, Yes, both will give same result.
The rule used to solve mathematical expressions is known as the BODMAS rule. The order of operations for mathematical formulas requiring several operations is known as BODMAS. B. Brackets, O. Order of powers, D. Division, M. Multiplication, A. Addition, and S. Subtraction make up the acronym.
−9×(−9)−9
⇒ - 9 × 81
⇒ -729
⇒ [−9×(−9)]−9
⇒ [81] -9
⇒ -729
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(20 points) i need help with this asap (the x is -20)
Answer:
119º and 61º
Step-by-step explanation:
2x-15 and 3x+5 are supplementary because the angles corresponding to 2x-15 is supplementary with 3x+5
2x-15+3x+5=180
5x-10=180
5x=190
x=38
fill in x
2(38)-15
=76-15
=61
angle is 61
fill in x for angle 2
3(38)+5
=114+5
=119
angle 2 is 119
simplify:-
(-4)3
this is the chapter of exponents and power
For a given recipe, 24 cups of flour are mixed with 12 cups of sugar. How many cups of sugar should be used if 8 cups of flour are used?
Answer:
First, 24 divided by 8 equals 3. this means you divide 12 by 3. you get 4. 4 cups of sugar will be used when 8 cups of flour are used.
A private university has a endowment fund that currently has 49 million dollars in it. if she invested in a one year cd that pays 5.12% interest compounded continuously, how much interest will it earn
If the university invest in a one year CD at 5.12% interest compounded continuously, the interest it will earn is determined by calculating as: Interest = Future value – Present value which would be $2.54 million
Continuously compounded interest means that a principal amount is constantly earning interest with infinite compounding periods for a certain time period. There are no increment compounding periods as with monthly or annually compounding.
The continuously compounding formula:
FV = PV* e^rt
Where FV is the future amount, PV is the initial amount, e is a mathematical constant (2.7183), r is the rate and t is the time period.
Hence,
FV = 49* 2.7183^(0.0512*1) =51.57
Interest earned= 51.57-49=2.54
Hence, the university will earn an interest of $2.54 million.
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Mai is filling her fish tank. Water flows into the tank at a constant rate complete the table you answer the questions. 1. How many gallons of water will be in the fish tank after 3 minutes? Explain your reasoning. 2. How long will it take to fill the tank with 40 gallons of water. Explain your reasoning. 3. What is the constant of proportionality?
Table:
0.5 : 0.8
1 : ?
3 : ?
? : 40
1. Based on the proportional relationship table created, 4.8 gallons of water will be in the fish tank after 3 mins.
2. 25 minutes.
3. The Constant of proportionality is: 1.6.
How to Determine the Constant of Proportionality?In a proportional relationship between variables x and y, the Constant of proportionality, k, is determined using any pair of values from the table as:
k = y/x.
The relationship is modelled as y = kx.
Constant of proportionality = k = y/x = 0.8/0.5
Constant of proportionality = k = 1.6
The equation for the relationship would be: y = 1.6x. Use the equation to complete the table:
For x = 1:
y = 1.6(1) = 1
For x = 3:
y = 1.6(3) = 4.8
For y = 40:
40 = 1.6x
40/1.6 = x
x = 25
The complete table is:
x y
0.5 0.8
1 1.6
3 4.8
25 40
1. Using the proportional relationship table, we can conclude that, 4.8 gallons of water will be in the fish tank after 3 mins.
2. Using the proportional relationship table, the time it would take to fill the tank with 40 gallons of water is: 25 mins.
3. Constant of proportionality = k = 1.6.
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