Mathematics College

Find the first term, a1, of an arithmetic sequence if a12 = 38 and a45 = 170.
–6

132/33

–5

6

Answers

Answer 1
Standard formula for arithmetic sequence:
an = a0 + d(n-1)

if we use the two terms given, setting a12 as starting term and a45 as the end term an.

170 = 38 + 33d 
170 - 38 = 33d
132 = 33d

132/33 = d
This is the common difference, use it to find the first term.

38 = a0 + (132/33)(12-1)
38 = a0 + (132/33)(11)
38 = a0 + 132/3
38 - 132/3 = a0
38 - 44 = a0
-6 = a0

The starting term is -6

Answer 2

The solution is: The starting term is -6

What is Arithmetic progression?

An arithmetic progression or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant.

Standard formula for arithmetic sequence:

an = a0 + d(n-1)

if we use the two terms given, setting a12 as starting term and a45 as the end term an.

170 = 38 + 33d 

170 - 38 = 33d

132 = 33d

132/33 = d

This is the common difference, use it to find the first term.

38 = a0 + (132/33)(12-1)

38 = a0 + (132/33)(11)

38 = a0 + 132/3

38 - 132/3 = a0

38 - 44 = a0

-6 = a0

The starting term is -6

To lean more on Arithmetic progression click:

brainly.com/question/28898589

#SPJ2

Related Questions

factor :
x^4 (x+4) + 9 (x+4)

Answers

[tex]x^4(x+4)+9(x+4)=(x+4)(x^4+9)[/tex]

Consider the following properties of the graph of an exponential function.
a. Horizontal Asymptote at x=-2
b. The graph is increasing from (-infinity, infinity)
c. The x-intercept is at (1,0)
What is the equation for this graph?

Answers

The parent exponential function is:

[tex]y= e^{x} [/tex]

The Horizontal asymptote of parent exponential function is y =0. For the function to have asymptote y=-2, it must be shifted 2 units down. So resulting graph will be:

[tex]y=e^{x} -2[/tex]

The function is increasing from left to right.

The above function does not have x-intercept at (1,0). For the function to have an x-intercept at (1,) it must be multiplied with some co-efficient as shown below:

[tex]y=a e^{x}-2 [/tex]

For x=1, y=0. So we can write:

[tex]0=a e^{1}-2 \\ \\ 2=ae \\ \\ a= \frac{2}{e} [/tex]

So, the exponential function satisfying the given conditions will be:

[tex]y= \frac{2}{e} e^{x}-2 \\ \\ y=2 e^{x-1} -2 [/tex]

A school table has 8 sides of equal lengths. if one side is 4 feet, what is the perimeter of the table?

Answers

Since the table has 8 sides that all have the same length then multiply 4 by 8 so the answer is 32 
One side = 4 feet

4 x 8= 32

Eight sides = 32 feet

use matrix method to solve x+4y=8 2x+y=9

Answers

In first equation, x has coefficient 1 and y has coefficient 4 and is equal to 8
In first equation, x has coefficient 2 and y has coefficient 1 and is equal to 9

So augmented matrix would looks like this:
[tex]\left[\begin{array}{cc|c}1&4&8\\2&1&9\end{array}\right][/tex]

Your goal is to transform matrix to look like this:
[tex] \left[\begin{array}{cc|c}1&0&x_{\text{answer}}\\0&1&y_{\text{answer}}\end{array}\right][/tex]

Steps to reach there:

Subtract first row from second row two times:
[tex]\left[\begin{array}{cc|c}1&4&8\\0&-7&-7\end{array}\right][/tex]

Multiple second row by -1/7:
[tex]\left[\begin{array}{cc|c}1&4&8\\0&1&1\end{array}\right][/tex]

Now subtract second row from first row 4 times:

[tex]\boxed{\left[\begin{array}{cc|c}1&0&4\\0&1&1\end{array}\right]}[/tex]

Which translate to
[tex]x+0y = 4\\\ \\0x+y=1[/tex]

So then x = 4 and y = 1.

Hope this helps.

What number is 8.0007 • 10 ^6 in scientific notation?

Answers

8,000,700

Take the decimal and move it six spaces to the right.
[tex]8.0007*(10*10*10*10*10*10)=8000700[/tex]

Answer is 8000700

Hope it helped you.

-Charlie

Will give branliest!
Please help me!

The students in Mr. McIntyre’s class and the students in Mrs. Ramos’s class were asked how many pets they each have. The dot plots below show the results. Which compares the means of the data in the dot plots?

The mean for Mr. McIntyre’s class is about 2 more than the mean for Mrs. Ramos’s class.

The mean for Mrs. Ramos’s class is about 2 more than the mean for Mr. McIntyre’s class.

The mean for Mr. McIntyre’s class is about 1 more than the mean for Mrs. Ramos’s class.

The mean for Mrs. Ramos’s class is about 1 more than the mean for Mr. McIntyre’s class.

*The first picture is Mr. McIntyre’s Class
*The second picture is Mrs. Ramos’s Class

Answers

The mean can be calculated by adding all of the values and dividing that sum by the number of values you added.  To take advantage of the way data is being collected, I am grouping the addends as, for example, 5(1), instead of writing out 1 + 1 + 1 + 1 + 1.

Mr. McIntyre's class mean is:
[tex]\frac{5(0)+5(1)+4(2)+ 1(3)}{5 + 5+4+1} = \frac{5+8+ 3}{15}= \frac{16}{15}= approx. 1.07[/tex]

Mrs. Ramos' class mean is:
[tex] \frac{1(0)+2(1)+2(2)+4(3)+3(4)+3(5)}{1+2+2+4+3+3} = \frac{2+4+12+12+15}{15}= \frac{45}{15}=3[/tex]

Based on these findings, we can conclude that the mean for Mrs. Ramos' class is about 2 more than the mean for Mr. McIntyre's class.

Answer:

If you are lazy like me the answer is B

Step-by-step explanation:

ur welcome :D

which has more people a car that is 3/4 full or a car that is 1/4 full

Answers

A car that is 3/4 full because 3 outta the 4 seats are taken while 1/4 is only  1 outta the 4 seats are taken up. Hope it helps  :).

A car of people 3/4 full would be more than a car of people 1/4 full because 3/4 is more than 1/4.

Set A is the set of all positive multiples of 2 that are less than or equal to 20. Set B is the set of all positive multiples of 4 that are less than or equal to 20. How many elements are positive multiples of 4 that are less than or equal to 20, but are not positive multiples of 2?

Answers

A = {2, 4, 6, 8, 10, 12, 14, 16, 18}
B = {4, 8, 12, 16}

All elements of set B are also elements of set A.

Answer: None.
All multiples of 4 are automatically multiples of 2.

the ratio of keiths age to Jared's ages 3 to 5 if Keith is 24 years old how old is Jared please show how many you got this answer I will mark brainiest

Answers

Comment
You need to set up a direct proportion. You have to relate Keith and Jared's ages to the ratio you were given.

Givens
Keith is 24
Keith / Jared = 3/5
J = Jared 

Solution
3/5 = 24 / J Cross multiply
3*J = 5 * 24 Combine factors on the right.
3J = 120     Divide by 3
J = 120 / 3
J = 40

Conclusion
Jared is 40 years old.

Remember: P(1+r)t Using the expression above, choose the correct answers for the new balance and the amount of interest earned in the following compound interest problem. $950 at 7% for 8 years, compounded annually. Total Amount = $ Interest Amount = $

Answers

Total amount
950×(1+0.07)^(8)
=1,632.28

Interest amount
1,632.28−950
=682.28

A rectangular deck is 12 ft by 14 ft. When the length and width are increased by the same amount, the area becomes 288 sq. ft. By how much were the dimensions increased?
2 ft
4 ft
8 ft
10 ft

Answers

To solve this problem you must apply the proccedure shown below:

 1. You have the following information given in the problem above:

 - The rectangular deck has the following dimensions: 12 ft by 14 ft.
 - When the length and width are increased by the same amount, the area becomes 288 ft².

 2. Therefore, you have:

 A=bxh

 288=(12x)(14x)
 288=168x²

 3. When you clear the x, you obtain:

 x=√288/168
 x=(2√21)/7≈1.31
 

Answer:

4 ft option (c)

Step-by-step explanation:

Length of a rectangular deck = 12 ft.

width of rectangular deck= 14 ft.

let the length and width are increased by the x ft.

New length = (12 + x) ft  

New width = (14+ x) ft.

area of rectangular width = length × width

according to the question

(12+x)(14+x) = 288

168+[tex]x^{2}[/tex]=+14x+12x = 288

[tex]x^{2}[/tex]+26x = 228-168

[tex]x^{2}[/tex]+26x-120=0

[tex]x^{2}[/tex]+ 30x-4x-120=0

x(x+30)-4x(x+30)

x=4 or x=-30

x=-30 is rejected

Hence, the length and width are increased by the 4 ft.

Researchers produced a study that involved 875 workers in the auto industry. The study showed that after 30 years 367 were retired, 85 were still employed in the auto industry, 300 left the industry, and the rest were not reachable. What is the problem with this study?


precise numbers


missing data


self interest


voluntary response

Answers

Answer: B) missing data

There are 123 people that were not reachable, making missing data the biggest problem.
It could be voluntary, but we're not told that, and it is most likely not voluntary, which also cancels out the chance that it could be self-interest. Precise numbers are usually what you want to aim for when you collect data, so that isn't a problem here. 
According to this problem missing data would be the answer(B)

Part I: Angle Sum Relationships
Arrange the three congruent triangles so that angles 1 and 3 are adjacent to one another, and angle 2 is adjacent to angles 1 and 3.

B. What do you notice about the three angles?

C. What do they appear to form?

D. What can you conclude about the sum of the angles in a triangle?

Answers

The three angles are adjacent to each other.
They appear to form a straight line.
It means that the sum of the three angles of a triangle is appears to be 180 degrees.

Answer with explanation:

→→The three Angles form a Linear pair.That is

 ⇒∠1+∠2+∠3=180°

→→When these three congruent triangles are joined they form a Trapezoid.

→→Sum of angles in a trangle is given by Angle sum property Axiom of triangle which states that sum of the angles in a triangle is 180°.

A rain gutter is to be constructed of aluminum sheets 12 inches wide. After marking off a length of 4 inches from each edge, this length is bent up at an angle θ. The area A of the opening may be expressed as the function: A(θ) = 16 sin θ ⋅ (cos θ + 1). If θ = 45°, what is the area of the opening?

A. 4.8 in2
B. 20.8 in2
C. 19.3 in2
D. 9.0 in2

Answers

Answer is A. 4.8 in 2

Answer:

19.3

Step-by-step explanation:

took the test

A house was valued at 398,000.over several the house increased by 0.08

Answers

Here's the equation to find the current price:
398000 + 0.08(398000)
We can make it simpler:
1.08(389000)
The current price is $420120

hey can you please help me posted picture of question

Answers

Answer:
The solutions are 4 and -4

Explanation:
To get the solutions, we will need to isolate x on one side of the equation.
This can be done as follows:
4x² - 30 = 34
4x² - 30 + 30 = 34 + 30
4x² = 64
x² = 64/4
x² = 16
x = ±√16
either x = +√16 = 4
or x = -√16 = -4

Hope this helps :)

[tex]4x^2-30=34\ \ \ |+30\\\\4x^2=64\ \ \ \ |:4\\\\x^2=16\to x=\pm\sqrt{16}\\\\x=\pm4\\\\\text{Answer:C. x=-4 and D. x=4}[/tex]

£600 is put in a bank. after a year the money has increased by 8% how much is now in the bank

Answers

increased = 8% x £600 = 0.08 x 600 = £48

Money in the bank now = £600 + £48 = £648


Answer: £648

The value of (a-1)+a^2-b^2/1-ab+2(a-b)/2b when a=2 and b=-1 is ?

Answers

The value of (a-1)+a^2-b^2/1-ab+2(a-b)/2b when a=2 and b=-1 will be evaluated as follows:
substituting the values in the expression we obtain:
(2-1)+2^2-(-1)^2/1-(2*(-1))+2(2-(-1))/(2(-1))
simplifying the above we get:
1+4-1/1-(-2)+2(2+1)/(-2)
=1+4-1+2(3)/(-2)
=1+4-1-3
=5-4
=1

Answer: 1

Final answer:

The value of the expression (a-1) + a^2 - b^2 / (1-ab) + 2(a - b) / (2b) when a=2 and b=-1 is -5/3.

Explanation:

To calculate the given expression when a=2 and b=-1, we first plug these values into the expression, which is (a - 1) + a^2 - b^2 / (1 - ab) + 2(a - b) / (2b). After substitution, it simplifies as follows:

The term (a - 1) becomes (2 - 1), which equals 1.

The term a^2 - b^2 becomes 2^2 - (-1)^2, which simplifies to 4 - 1 = 3.

The denominator 1-ab becomes 1 - (2)(-1), which equals 1 + 2 = 3.

The term 2(a - b) becomes 2(2 - (-1)), which is 2(3) = 6.

The denominator 2b becomes 2(-1), which is -2.

Now, the full expression simplifies to (1 + 3) / 3 + 6 / -2. Simplifying further, we get 4 / 3 + (-3), which equals to 4/3 - 3/1. After finding a common denominator, the expression simplifies to (4 - 9) / 3, which is -5/3.

Therefore, the value of the expression when a=2 and b=-1 is -5/3.

An experienced roofer can work twice as fast as her helper. working together, they can shingle a new section of roof in 4 hours. how long would it take the experienced roofer, working alone, to complete the same job?

Answers

Final answer:

The problem solves for the time it would take the roofer to work alone, by first determining the shared work rate. The helper works at rate x and the roofer at rate 2x (twice as fast). They complete 1 roof in 4 hours working together, thus their combined rate is 1/12 roof per hour. So, the roofer’s individual rate is 1/6 roof per hour, meaning she can finish the job alone in 6 hours.

Explanation:

To solve this problem, we'll use the equation for work which is work = rate x time. Let's say the helper's rate of work as 1x and the roofer's rate as 2x, because the roofer can work twice as fast as the helper.

Bearing in mind that the total time it takes both of them to shingle the roof is 4 hours, according to the problem, we can represent this relationship as this equation: (2x + x) * 4 = 1 roof. This simplifies to 12x = 1, meaning the rate at which they work together is x = 1/12 roof per hour.

Thus, the roofer’s individual rate of work is 2x = 2/12 roof per hour = 1/6 roof per hour. Therefore, to calculate how much time it would take for the roofer to do the job alone, we simply divide the total task (1 roof) by the roofer’s rate of work, 1/(1/6) = 6 hours.

Learn more about work rate here:

https://brainly.com/question/14305692

#SPJ12

Final answer:

By setting up and solving an algebraic equation based on the given conditions in the problem, we find that it would take the experienced roofer alone 3 hours to complete the same job.

Explanation:

The problem is related to work rate and could be solved using algebra. Let's denote by X the time (in hours) it takes for the helper to complete the job alone. Considering that an experienced roofer can work twice as fast as her helper, the roofer could complete the same job alone in X/2 hours. From the problem, we know that when working together, they can complete the job in 4 hours. This means that the amount of work they do together in one hour (1/4) is equal to the sum of the amounts of work done by each in one hour (1/X + 2/X). By solving this equation, we get X = 6. So, it would take the helper 6 hours to complete the job, which means it would take the experienced roofer half of this time, which is 3 hours.

Learn more about Work rate here:

https://brainly.com/question/14305692

#SPJ12

Find the volume of the given prism round to the nearest 10th if necessary

Answers

we know that
volume of the prism=area of the base*height
height=24 yd

area of the base
is a equilateral triangle
so
the internal angles are 60 degrees
with the law of sine calculate the area
Area=(1/2)*a*b*sin C-----> (1/2)*13*13*sin 60-----> (1/2)*13*13*√3/2
Area=73.18 yd²

volume of the prism=73.18*24-----> 1756.30 yd³

the answer is
1756.3 yd³

solve for x x^2+3x<28

Answers

x² + 3x < 28
x² + 3x - 28 < 0
(x+7)(x-4) < 0

the zeros will be at x = -7  and x =4

∴ the solution of inequality
x ∈ (-7,4)

See the attached figure




In a clinical trial for a new headache medication, participants are randomly assigned to a treatment group or a placebo group. They do not know whether they are receiving the medication or a placebo. The element of experiment design being used is _____.


randomization


blinding


replication

Answers

This is called randomization

Answer:

The element of experiment design being used is blinding.

Step-by-step explanation:

In a clinical trial for a new headache medication, participants are randomly assigned to a treatment group or a placebo group.  

The first step is to define the treatment group, it is performed in a random way, as most of the statically experiments.  

They do not know whether they are receiving the medication or a placebo.  

People inside both groups do not have information about the medication. It means they are blind to the possible effects.  

The blinding method is used mostly to remove the placebo effect in the sample. Because of that it is commonly used for clinical or any experimental assays as it was showed in this example.

the arc lenght of pi over 3 and 10m

Answers

[tex]\bf \textit{arc's length}\\\\ s=r\theta ~~ \begin{cases} r=radius\\ \theta =angle~in\\ \qquad radians\\ ------\\ r=10\\ \theta =\frac{\pi }{3} \end{cases}\implies s=10\cdot \cfrac{\pi }{3}\implies s=\cfrac{10\pi }{3}[/tex]

The acronym CPCTC stands for “corresponding parts of congruent __________ are congruent.”

Answers

The Blank is: Triangles

Cpctc is Corresponding parts of congruent triangles are congruent.

It is used at the end of your proof to show two sides and two angles are congruent.

Hope this helps!

Answer: Triangles

Step-by-step explanation:

The CPCTC property of congruent triangles says that is two triangles are congruent then their corresponding angles and sides are congruent.

The acronym CPCTC basically stands for Corresponding Parts of Congruent Triangles are congruent.

It generally used two show any two corresponding segments or angles of two congruent triangles congruent.

Hey can you please help me posted picture of question

Answers

The correct answer is the option D.

 The explanation is shown below:

 1. As you can see in the figure attached, the blue parabola has the function f(x)=x^2. This is the patern function.  By definition, this is the most basic function of the quadratics functions.

 2. The red parabola is shifted 2 units to the -y axis and is wider than the first one, by multiplying the variable x. Therefore. As you can see, the correct function that represents this parabola is the function of the option D
 3. If you want to verify it, you can give values to x and plot each point on a graph.
If you observe the two graphs you can note that:

a) F(x) is wider than G(x)
This can be obtained by multiplying the function by a value with magnitude less than 1.

b) F(x) is shifted down 
This can be obtained by subtracting a number from the function value.

From the given option, only option D satisfies these conditions.

So, the correct answer is option D

Complete the steps to find the volume of the prism shown below.

Answers

Answer:

triangle

A = 6

V = 6 x 20 = 120

Step-by-step explanation:

Answer:

Shape of base - triangle

A = 6 units

V = 6 x 20 = 120

Hope it helps!

A line segment with endpoints (-4,5) and (-2,2) is reflected about the y-axis. Write the coordinates of the endpoints after the segment has been reflected.

Answers

When reflection goes about y-axis, the x coordinate changes into its opposite.
(-4,5)---->(4,5)
(-2,2)----->(2,2)

A video rental store charges $4 per day to rent a movie and $3 per day to rent a video game. During one summer, Tony paid a total of $140 to rent movies and video games from this store. If he rented twice as many video games as movies, how much did he spend on movie rentals during the summer?

Answers

Let's use the variables m and v for this:
4m + 3v = 140
v = 2m
Insert this variable:
4m + 3(2m) = 140
4m + 6m = 140
10m = 140
m = 14
One movie costs 4 dollars:
14*4 = 56
He spent $56 on movies

Evaluate the polynomial when x=4 y=-4
x^2-3y^2+2xy

Answers

[tex]x^2-3y^2+2xy\\\\for\ x=4\ and\ y=-4\\\\substitute\ the\ values\ of\ x\ and\ y:\\\\4^2-3\cdot(-4)^2+2\cdot4\cdot(-4)=16-3\cdpt16-32=16-48-32=-64[/tex]

PLEASE HELP ME OUT ASAP!! I would really appreciate your help!

Answers

The first thing you need to do is get a graph for the corn. This one is not very good, but it will get you an answer. While the potatoes graph is going from 50000 to 40000 (slowly), the corn  graph is going up like a rocket trajectory. So eventually, the Baker family will produce more corn than potatoes. That's D.

Answer D.

Problems with AB and C
A
The problem with A is that they won't always produce more potatoes than corn. That will happen only in the beginning.

B
Clearly B is wrong. The amount of corn in the beginning was 25000 pound. In the meantime potatoes were produced at a yearly rate of nearly 50000 pounds of potatoes.

C is wrong because of what A says.
 
Other Questions
Technology has become an important part of peoples lives. Children are growing up surrounded by advertising, digital media, and more. They have greater access to tablets, computers, movies, and other media. Is technology becoming a threat to childhood? Should regulations be in place to protect children? The first step in managing it security is to develop a _____ based on confidentiality, integrity, and availability.a. risk policyb. security policyc. threat reportd. concealment report What mass of magnesium bromide would be required to prepare 720? failure to pay on a mortgage is called Given: ABCD is a trapezoid, AC CD AB = CD, AC=the square root of 75 , AB = 5 Find: AABCD Turtle and vicent combine their coins to find they have all dimes and quarters .They have 8 more quarters them dimes and the coins are worth a total of 5.15 .How many dimes and quarters do they have? Which was the Church official who supervised several bishops? priest high bishop pope archbishop A roof rises 9 feet for every 12 feet of run. What is the slope of the roof?A.) -3B.) 3C.) 3/4D.) 4/3 Which of the following synonyms is the best choice for discussing something truly funny? A. Amusing B. Playful C. Clever D. Hilarious Jack Watkins earns a base salary of $1500 a month, plus a 4% commission on the sales he makes. What is his gross pay of his sales for the month are $8000. A. 1520B. 1532C. 1700D. 1820 Pq o militares se meteram no governo de d pedro segundo? The Zero Tolerance Law Means Use part 1 of the fundamental theorem of calculus to find the derivative of the function. g(x) = x e2t2 4t dt 4 What did the confederate congress pass in april 1862 to deal with declining enlistments in the army? Which factor does not affect the elasticity of demand for a good? 1. d^2 + 12d + 32(d + 8)(d + 4)(d - 8)(d - 4)(d - 8)(d + 4) (d + 8)(d - 4)2.d^2 - 12d + 32(d - 4)(d - 8)(d - 4)(d + 8)(d + 4)(d - 8)(d + 4)(d + 8)5.x^2 + 3xy - 4y^2(x + 4y)(x + y) (x - 4y)(x - y) (x - 4y)(x + y) (x + 4y)(x -y) Which is the main job of the Supreme Court? what literary device does pie use in line 4? what does this add to the effect of the stanza? Given rectangle PQRS with PQ=QR, PQ=SP, and SQ=62. Find SR. a)2. b) 6. c) 52 d) not enough information 1920s is often referred to as the jazz age. jazz has its roots in