1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kirza4 [7]
2 years ago
13

Find the 21st term of the sequence 15,8,1,-6

Mathematics
1 answer:
Alika [10]2 years ago
7 0

Answer:

-125

Step-by-step explanation:

Each term is 7 less than the previous term.

1st term: 15

2nd term: 15 - 7

3rd term: 15 - 7 - 7 = 15 - 2(7)

4th term = 15 - 7 - 7 - 7 = 15 - 3(7)

Notice that each term is 15 minus a multiple of 7. The multiple is obtained by multiplying 7 by 1 less than the term number.

The formula is:

a_n = 15 - 7(n - 1)

For the 21st term, multiply 7 by 20, and subtract from 15.

7 × 20 = 140

15 - 140 = -125

Using the formula:

a_{21} = 15 - 7(21 - 1) = 15 - 7(20) = 15 - 140 = -125

Answer: -125

You might be interested in
Which function is the inverse of f(x) = 2x + 3?
lianna [129]

Answer:

y = 1/2x - 3/2

Step-by-step explanation:

The easiest way to find the inverse is to switch x and y and solve for y.

y = 2x + 3

x = 2y + 3 (Switch)

x-3 = 2y (Subtract y from both sides)

x/2 - 3/2 = y (Divide both sides by 2)

8 0
3 years ago
Read 2 more answers
A group of students were surveyed to find out if they like building snowmen or skiing as a winter activity. The results of the s
nignag [31]

Answer:

The answer could be easier if you make a ratio and actual graph

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Please help.... what is it’s measure
Olegator [25]

right

Answer:

90°

Step-by-step explanation:

Type of angle foremd= right

Measure = 40° + 50° = 90°

8 0
3 years ago
Read 2 more answers
Pls, look at picture for the question.
Lady bird [3.3K]

point D,C,A...... ......

8 0
3 years ago
Read 2 more answers
The loudness of a jackhammer is a 96 dB. It sounds intense is about _____ . The Loudness of a compactor is 94 dB. It's sound int
aleksandr82 [10.1K]

Answer:

loudness of a jack hammer .004 loudness of a compactor .0025

Step-by-step explanation:

Because edge

8 0
3 years ago
Other questions:
  • 4/7x = 64 <br> Answer for x
    6·2 answers
  • Darius and Anita took the same test. Darius answered 5/6 of the questions correctly, and Anita answered 6/7 correctly. Who got t
    8·2 answers
  • Please help asap! Ty!
    9·1 answer
  • In the diagram of circle C,what is the measure of &lt;1?
    11·1 answer
  • Sue Anne owns a medium-sized business. The probability model below describes the number of employees that may call in sick on an
    14·1 answer
  • Please help! Correct answer only, please!
    7·2 answers
  • Y=3x+62x+4y=−4 What is the value of y in the system?
    15·1 answer
  • (b) The sum of a number and its reciprocal is<br> 2 1/6.Find the number
    11·1 answer
  • Given the figure below solve for X
    12·1 answer
  • Please assist me on this question please
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!