Identify The 27Th Term Of An Arithmetic Sequence Where A1 = 38 And A17 = −74? (Solution)

The 27th term of an arithmetic sequence where a1 = 38 and a17 = -74 is -144.

How do you find the 25th term of an arithmetic sequence?

Solution: A sequence in which the difference between all pairs of consecutive numbers is equal is called an arithmetic progression. The sequence given is 3, 9, 15, 21, 27, … Therefore, the 25th term is 147.

How do you find a term of an arithmetic sequence?

Step 1: The nth term of an arithmetic sequence is given by an = a + (n – 1)d. So, to find the nth term, substitute the given values a = 2 and d = 3 into the formula.

How do you find the 21st term of an arithmetic sequence?

The formula for the nth term of an arithmetic sequence is the following: a (n) = a1 + (n-1) *d where d is the common difference, a1 is the first term, and n is the sequence term. In this case, d = 4, a1 = 8.

How do you find the 15th term of an arithmetic sequence?

$n^{th}$ term of an A.P. is given by $a_n= a+(n-1)d$. In order to determine the 15th term of the given arithmetic sequence, we relate the given numbers with the general sequence of A.P. and Using the $n^{th}$ term formula, we find the 15th term in the given A.P.

What is the arithmetic between 10 and 24?

Using the average formula, get the arithmetic mean of 10 and 24. Thus, 10+24/2 =17 is the arithmetic mean.

What is the thirty second term?

2: the quotient of a unit divided by 32: one of 32 equal parts of anything one thirty-second of the total.

What is the sum of the terms of the arithmetic sequence 34 39 44 49?

Therefore, you answer is 700.

Identify the 27th term of an arithmetic sequence where a1 = 38 and a17 = -74. -20.5 -151 -22.75 -144

Figure out how to get to the 27th term of an arithmetic series where a1 = 38 and the last term is a17 = -74.5-205.15-215-22.75-144


The following is the arithmetic sequence: an=a1+(n-1)d d=-112/16=-7D)-144-53 The following is a step-by-step explanation: There must be a common difference between two sequences in order for them to be considered arithmetic sequences (d). The common difference is represented by the symbol d =-=-. From the following sequence:a = -1d = -3 – (-1)d = -3 + 1d = -2d = -3d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2d = -2 The following is the formula for the nth term of an arithmetic sequence:= a + b (n – 1) d Because there are 27 words in total, the 27th term will be equal to a + b.

So the 27th term equals -53 in this case.

  1. where is the first term, and d is the difference between the two terms The first term is 38; find the value of d.
  2. Now, using a1=38 and d=-7, we can find 26 terms.
  3. a = a1 + a2 (n-1) the value of r a27 =38+26(-7) =144 An arithmetic series has n terms, and we need to get the nth term.
  4. To begin, we must compute for d using the values that have been provided above.
  5. a = a1 + a2 (n-1) d -74 = 38 + d -74 = (17-1) d d = -7 d d The following is the formula for calculating the 27th term: a27 = a1 plus a2 (n-1) the derivative of a27 = 38 + (27-1)(-7) a27 = -144 OPTION The answer will be provided by him/her on your behalf.

How to find the nth term of an arithmetic sequence – Algebra 1

When considering an arithmetic sequence, the first term is, and the fifth term is. What is the second slang phrase? The correct response is:Explanation: The formula can be used to determine the common difference. Isandis is the name we use. We now have a problem to solve. The second term is obtained by multiplying the first term by the common difference. When you add up the first three terms of an arithmetic sequence, you get 111; the sum of the fourth term gets you 49. What is the first term in the sentence?

  • The correct response is:Explanation: Let us consider the common distinction, and let us consider the second term.
  • We now know that the second term is 37 days long.
  • The most frequently encountered difference is 6.
  • The first character in an arithmetic sequence is.
  • The fourth and tenth terms of an arithmetic sequence are 372 and 888, respectively.
  • Let us consider the common difference in the sequence as our correct answer:Explanation: Then, alternatively, or equivalently, or alternatively, The ninth and tenth terms of an arithmetic sequence have the numbers 87 and 99, respectively, in their respective positions.
  • The correct response is:Explanation: It is the difference between the tenth and ninth terms in the sequence that is the most common difference:.

We set this equal to 87, and then proceed to solve: There are two terms in an arithmetic sequence that are the eighth and tenth terms, respectively: 87 and 99.

The correct response is: An explanation: The eighth and tenth terms of the sequence are and, where is the first term and is the common difference between the two terms.

The correct response is: Explanation: We must first discover a rule for this arithmetic sequence in order to be able to calculate the 100th term.

This is the crux of the matter.


For the hundredth and final time, Thus To find any term in an arithmetic sequence, do the following: The first term is, is the number of terms to find, and is the common difference between the first and last terms in the sequence Figure out which of the following arithmetic sequence’s 18th term is correct.

Then, using the formula that was provided before the question, write: To find any term in an arithmetic sequence, use the following formula:where is the first term, is the number of terms to be found, and is the common difference between the terms in the sequence.

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Then, fill in the rest of the equation given before the question.

1, 5, 9, 13,.

Each gap has a difference of +4, so the 11th term would be given by 10 * 4 + 1 = 41. The first term is 1. Each term after increases by +4. The n thterm will be equal to 1 + (n – 1)(4). (4). The 11th term will be 1 + (11 – 1)(4)1 + (10)(4) = 1 + (40) = 41

Identify the 27th term of an arithmetic sequence where a1 = 38 and a17 = −74 −20.5 −151 −22.75 −144

Mathematics, 21st of June, 14:30, The center of the circle is represented by the point an in the illustration. Which two lengths must be in the same proportion as one another? (The possibilities are shown in the photos because they were deemed to be damaging terms.) Answers are as follows: 1 The 21st of June, 14:30, azaz1819, mathematics Determine if segment mn is parallel to segment kl in terms of geometry. Please provide justification for your response. jm 6 mk 3 jn 8 nl jm 6 mk 3 jn 8 nl 4 Answers are as follows: 3 Jonathan’s mp3 player has a 5:6 ratio of rock music to dance tracks, according to his playlist.

  • How many rock tunes does he have under his belt?
  • After 33 rounds of the game, he has 88 tokens left in his hand to spend.
  • The quantity tt of tokens that James holds is a function of gg, which is the number of games that he has participated in.
  • Identify the 27th term in an arithmetic series in which a1 = 38 and a17 = 7420.5151 is the first term.

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Arithmetic Sequences and Series

HomeLessonsArithmetic Sequences and Series Updated July 16th, 2020
Sequences of numbers that follow a pattern of adding a fixed number from one term to the next are called arithmetic sequences. The following sequences are arithmetic sequences:Sequence A:5, 8, 11, 14, 17,.Sequence B:26, 31, 36, 41, 46,.Sequence C:20, 18, 16, 14, 12,.Forsequence A, if we add 3 to the first number we will get the second number.This works for any pair of consecutive numbers.The second number plus 3 is the third number: 8 + 3 = 11, and so on.Forsequence B, if we add 5 to the first number we will get the second number.This also works for any pair of consecutive numbers.The third number plus 5 is the fourth number: 36 + 5 = 41, which will work throughout the entire sequence.Sequence Cis a little different because we need to add -2 to the first number to get the second number.This too works for any pair of consecutive numbers.The fourth number plus -2 is the fifth number: 14 + (-2) = 12.Because these sequences behave according to this simple rule of addiing a constant number to one term to get to another, they are called arithmetic sequences.So that we can examine these sequences to greater depth, we must know that the fixed numbers that bind each sequence together are called thecommon differences. Mathematicians use the letterdwhen referring to these difference for this type of sequence.Mathematicians also refer to generic sequences using the letteraalong with subscripts that correspond to the term numbers as follows:This means that if we refer to the fifth term of a certain sequence, we will label it a 5.a 17is the 17th term.This notation is necessary for calculating nth terms, or a n, of sequences.Thed -value can be calculated by subtracting any two consecutive terms in an arithmetic sequence.where n is any positive integer greater than 1.Remember, the letterdis used because this number is called thecommon difference.When we subtract any two adjacent numbers, the right number minus the left number should be the same for any two pairs of numbers in an arithmetic sequence.
To determine any number within an arithmetic sequence, there are two formulas that can be utilized.Here is therecursive rule.The recursive rule means to find any number in the sequence, we must add the common difference to the previous number in this list.Let us say we were given this arithmetic sequence.
First, we would identify the common difference.We can see the common difference is 4 no matter which adjacent numbers we choose from the sequence.To find the next number after 19 we have to add 4.19 + 4 = 23.So, 23 is the 6th number in the sequence.23 + 4 = 27; so, 27 is the 7th number in the sequence, and so on.What if we have to find the 724th term?This method would force us to find all the 723 terms that come before it before we could find it.That would take too long.So, there is a better formula.It is called theexplicit rule.So, if we want to find the 724th term, we can use thisexplicit rule.Our n-value is 724 because that is the term number we want to find.The d-value is 4 because it is thecommon difference.Also, the first term, a 1, is 3.The rule gives us a 724= 3 + (724 – 1)(4) = 3 + (723)(4) = 3 + 2892 = 2895.
Each arithmetic sequence has its own unique formula.The formula can be used to find any term we with to find, which makes it a valuable formula.To find these formulas, we will use theexplicit rule.Let us also look at the following examples.Example 1 : Let’s examinesequence Aso that we can find a formula to express its nth term.If we match each term with it’s corresponding term number, we get:

The fixed number, which is referred to as the common differenceor d-value, is three. We may use this information to replace the explicit rule in the code. As an example, a n= a 1+ (n – 1)d. a n = a 1 + a (n – 1) the value of da n= 5 + (n-1) (3) the number 5 plus 3n – 3a the number 3n + 2a the number 3n + 2 When asked to identify the 37th term in this series, we would compute for a 37 in the manner shown below. the product of 3n and 2a 37 is 3(37) + 2a 37 is 111 + 2a 37 is 113. Exemple No. 2: For sequence B, find a formula that specifies the nth term in the series.

We can identify a few facts about it.Its first term, a 1, is 26.Itscommon differenceor d-value is 5.We can substitute this information into theexplicit rule.a n= a 1+ (n – 1)da n= 26 + (n – 1)(5)a n= 26 + 5n – 5a n= 5n + 21Now, we can use this formula to find its 14th term, like so. a n= 5n + 21a 14= 5(14) + 21a 14= 70 + 21a 14= 91ideo:Finding the nth Term of an Arithmetic Sequence uizmaster:Finding Formula for General Term
It may be necessary to calculate the number of terms in a certain arithmetic sequence. To do so, we would need to know two things.We would need to know a few terms so that we could calculate the common difference and ultimately the formula for the general term.We would also need to know the last number in the sequence.Once we know the formula for the general term of a sequence and the last term, the procedure involves the use of algebra.Use the two examples below to see how it is done.Example 1 : Find the number of terms in the sequence 5, 8, 11, 14, 17,., 47.This issequence A.In theprevious section, we found the formula to be a n= 3n + 2 for this sequence.We will use this along with the fact the last number, a n, is 47.We will plug this into the formula, like so.a n= 3n + 247 = 3n + 245 = 3n15 = nn = 15This means there are 15 numbers in this arithmetic sequence.Example 2 : Find the number of terms in the arithmetic sequence 20, 18, 16, 14, 12,.,-26.Our first task is to find the formula for this sequence given a 1= 20 and d = -2.We will substitute this information into theexplicit rule, like so.a n= a 1+ (n – 1)da n= 20 + (n – 1)(-2)a n= 20- 2n + 2a n= -2n + 22Now we can use this formula to find the number of terms in the sequence.Keep in mind, the last number in the sequence, a n, is -26.Substituting this into the formula gives us.a n= -2n + 22-26 = -2n + 22-48 = -2n24 = nn = 24This means there are 24 numbers in the arithmetic sequence.
Given our generic arithmeticsequence.we can add the terms, called aseries, as follows.There exists a formula that can add such a finite list of these numbers.It requires three pieces of information.The formula is.where S nis the sum of the first n numbers, a 1is the first number in the sequence and a nis the nth number in the sequence.If you would like to see a derivation of this arithmetic series sum formula, watch this video.ideo:Arithmetic Series: Deriving the Sum FormulaUsually problems present themselves in either of two ways.Either the first number and the last number of the sequence are known or the first number in the sequence and the number of terms are known.The following two problems will explain how to find a sum of a finite series.Example 1 : Find the sum of the series 5 + 8 + 11 + 14 + 17 +. + 128.In order to use the sum formula.We need to know a few things.We need to know n, the number of terms in the series.We need to know a 1, the first number, and a n, the last number in the series.We do not know what the n-value is.This is where we must start.To find the n-value, let’s use the formula for the series.We already determined the formula for the sequence in a previous section.We found it to be a n= 3n + 2.We will substitute in the last number of the series and solve for the n-value.a n= 3n + 2128 = 3n + 2126 = 3n42 = nn = 42There are 42 numbers in the series.We also know the d = 3, a 1= 5, and a 42= 128.We can substitute these number into the sum formula, like so.S n= (1/2)n(a 1+ a n)S 42= (1/2)(42)(5 + 128)S 42= (21)(133)S 42= 2793This means the sum of the first 42 terms of the series is equal to 2793.Example 2 : Find the sum of the first 205 multiples of 7.First we have to figure out what our series looks like.We need to write multiples of seven and add them together, like this.7 + 14 + 21 + 28 +. +?To find the last number in the series, which we need for the sum formula, we have to develop a formula for the series.So, we will use theexplicit ruleor a n= a 1+ (n – 1)d.We can also see that d = 7 and the first number, a 1, is 7.a n= a 1+ (n – 1)da n= 7 + (n – 1)(7)a n= 7 + 7n – 7a n= 7nNow we can find the last term in the series.We can do this because we were told there are 205 numbers in the series.We can find the 205th term by using the formula.a n= 7na n= 7(205)a n= 1435This means the last number in the series is 1435.It means the series looks like this.7 + 14 + 21 + 28 +. + 1435To find the sum, we will substitute information into the sum formula. We will substitute a 1= 7, a 205= 1435, and n = 205.S n= (1/2)n(a 1+ a n)S 42= (1/2)(205)(7 + 1435)S 42= (1/2)(205)(1442)S 42= (1/2)(1442)(205)S 42= (721)(205)S 42= 147805This means the sum of the first 205 multiples of 7 is equal to 147,805.

Arithmetic Sequence Calculator

Using this arithmetic sequence calculator (sometimes referred to as the arithmetic series calculator) you can easily analyze any sequence of integers that is generated by adding a constant value to each number in the sequence each time. You may use it to determine any attribute of a series, such as the first term, the common difference, the nth term, or the sum of the first n terms, among other possibilities. You may either start using it right away or continue reading to learn more about how it works.

An introduction of the distinctions between arithmetic and geometric sequences, as well as an easily understandable example of how to use our tool, are also included.

What is an arithmetic sequence?

To answer this question, you must first understand what the terms sequence and sequencemean. In mathematics, a sequence is defined as a collection of items, such as numbers or characters, that are presented in a specified order, as defined by the definition. The items in this sequence are referred to as elements or terms of the sequence. It is fairly typical for the same object to appear more than once in a single sequence of pictures. An arithmetic sequence is also a collection of items — in this case, a collection of numbers.

Such a series can be finite if it contains a certain number of terms (for example, 20 phrases), or it can be unlimited if we do not define the number of words to be contained.

If you know these two numbers, you’ll be able to write out the entire sequence in your head.

Arithmetic sequence definition and naming

The concept of what is an arithmetic sequence may likely cause some confusion when you first start looking into it, so be prepared for that. It occurs as a result of the many name standards that are now in use. The words arithmetic sequence and series are two of the most often used terms in mathematics. The first of them is also referred to as anarithmetic progression, while the second is referred to as the partial sum. When comparing sequence and series, the most important distinction to note is that, by definition, an arithmetic sequence is just the set of integers generated by adding the common difference each time.

For example, S 12= a 1+ a 2+.

Arithmetic sequence examples

The following are some instances of an arithmetic sequence:

  • 3, 5, 7, 9, 11, 13, 15, 17, 19, 21,.
  • 6, 3, 0, -3, -6, -9, -12, -15,.
  • 50, 50.1, 50.2, 50.3, 50.4, 50.5,.

Is it possible to identify the common difference between each of these sequences? As a hint, try deleting a term from the phrase after this one. You can see from these examples of arithmetic sequences that the common difference does not necessarily have to be a natural number; it may be a fraction instead. In fact, it isn’t even necessary that it be favorable! In arithmetic sequences, if the common difference between them is positive, we refer to them as rising sequences. The series will naturally be descending if the difference between the two numbers is negative.

  • As a result, you will have a amonotone sequence, in which each term is the same as the one before.
  • are all possible combinations of numbers.
  • You shouldn’t be allowed to do so in any case.
  • Each phrase is discovered by adding the two terms that came before it.

A fantastic example of the Fibonacci sequence in action is the construction of a spiral. If you drew squares with sides that were the same length as the consecutive terms of this sequence, you’d have a perfect spiral as a result. This spiral is a beautiful example of perfection! (credit:Wikimedia)

Arithmetic sequence formula

Consider the scenario in which you need to locate the 30th term in any of the sequences shown above (except for the Fibonacci sequence, of course). It would be hard and time-consuming to jot down the first 30 terms in this list. The good news is that you don’t have to write them all down, as you presumably already realized! If you add 29 common differences to the first term, that is plenty. Let’s generalize this assertion to produce the arithmetic sequence equation, which can be written as It is the formula for any nth term in a sequence that is not a prime.

  • A1 is the first term of the series
  • An is the nth phrase of the sequence
  • D is the common difference
  • And A is the nth term of the sequence

Whether the common differences are positive, negative, or equal to zero, this arithmetic sequence formula may be used to solve any problem involving arithmetic sequences. It goes without saying that in the event of a zero difference, all terms are equal to one another, making any computations redundant.

Difference between sequence and series

For your convenience, our arithmetic sequence calculator can also calculate the sum of the sequence (also known as the arithmeticseries). Believe us when we say that you can do it yourself – it isn’t that difficult! Take a look at the first example of an arithmetic sequence: 3, 5, 7, 9, 11, 13, 15, 17, 19, 21 in the number 3. We could do a manual tally of all of the words, but this is not essential. Let’s try to structure the terms in a more logical way to summarize them. First, we’ll combine the first and last terms, followed by the second and second-to-last terms, third and third-to-last terms, and so on.

This implies that we don’t have to add up all of the numbers individually.

This is written as S = n/2 * (a1 + a) in mathematical terms.

Arithmetic series to infinity

When attempting to find the sum of an arithmetic series, you have surely observed that you must choose the value ofn in order to compute the partial sum of the sequence. What if you wanted to condense all of the terms in the sequence into one sentence? With the right intuition, the sum of an infinite number of terms will equal infinity, regardless of whether the common difference is positive, negative, or even equal to zero in magnitude. However, this is not always the true for all sorts of sequences.

Arithmetic and geometric sequences

No other form of sequence can be analysed by our arithmetic sequence calculator, which should come as no surprise. For example, there is no common difference between the numbers 2, 4, 8, 16, 32,., and the number 2. This is due to the fact that it is a distinct type of sequence — ageometric progression. When it comes to sequences, what is the primary distinction between an algebraic and a geometric sequence? While an arithmetic sequence constructs each successive phrase using a common difference, a geometric sequence constructs each consecutive term using a common ratio.

The so-called digital universe is an interesting example of a geometric sequence that is worth exploring.

You’ve probably heard that the amount of digital information doubles in size every two years, and this is correct. Essentially, it implies that you may create a geometric series of integers expressing the quantity of data in which the common ratio is two in order to convey the amount of data.

Arithmetico–geometric sequence

A unique sort of sequence, known as a thearithmetico-geometric sequence, may also be studied in detail. In order to produce it, you must multiply the terms of two progressions: an arithmetic progression and a geometric progression. Think about the following two progressions, as an illustration:

  • The following is the arithmetic sequence: 1, 2, 3, 4, 5,. The geometric series is as follows: 1, 2, 4, 8, 16,.

If you want to get the n-th term of the arithmetico-geometric series, you must multiply the n-th term of the arithmetic progression by the n-th term of the geometric progression, which is the n-th term of the geometric progression. In this situation, the outcome will look somewhat like this:

  • The first term is 1 * 1
  • The second term is 2 * 2
  • The third term is 3 * 4
  • The fourth term is 4 * 8
  • And the fifth term is 5 * 16 = 80.

Four parameters define such a sequence: the initial value of the arithmetic progressiona, the common differenced, the initial value of the geometric progressionb, and the common ratior. These parameters are described as follows:

Arithmetic sequence calculator: an example of use

Let’s look at a small scenario that can be solved using the arithmetic sequence formula and see what we can learn. We’ll take a detailed look at the free fall scenario as an example. A stone is tumbling freely down a deep pit of darkness. Four meters are traveled in the first second of the video game’s playback. Every second that passes, the distance it travels increases by 9.8 meters. What is the distance that the stone has traveled between the fifth and ninth seconds of the clock? It is possible to plot the distance traveled as an arithmetic progression, with an initial value of 4 and a common difference of 9.8 meters.

However, we are only concerned with the distance traveled from the fifth to the ninth second of the second.

Simply remove the distance traveled in the first four seconds (S4,) from the partial total S9.

S4 = n/2 *= 4/2 *= 74.8 m = n/2 *= 4/2 *= S4 is the same as 74.8 meters.

It is possible to use the arithmetic sequence formula to compute the distance traveled in each of the five following seconds: the fifth, sixth, seventh, eighth, and ninth seconds.

Make an attempt to do it yourself; you will quickly learn that the outcome is precisely the same!

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