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
Ronch [10]
2 years ago
10

In an arithmetic sequence, = 5 and = 11.

Mathematics
1 answer:
Free_Kalibri [48]2 years ago
5 0

Answer:

1134.62 (THE SUM OF 20 TERMS)

Step-by-step explanation:

First we write out our given information:

a8=2a2

a11=18

an is an arithmetic sequence.

Where here an means the nth term of our sequence.

What does an arithmetic sequence mean? It means to get to the next term in your sequence you add a constant (c) each time:

an+1=an+c

Equivalently:

an+1−an(n+1)−n=c

So an is of slope c (c2 is another constant):

an=cn+c2

Where here c2=a0 (Substitute in n=0 and see why that has to be the case if we let a0 exist)

Now we use the other given information to try to come up with a solution.

Let n=2:

a2=2c+c2

Let n=8, using the above equation we have:

a8=8c+c2=2a2=4c+2c2

Let n=11

a11=18

a11=11c+c2

But a11−a8=(11c+c2)−(8c+c2)=3c

Hence, a11=3c+a8

a11=3c+4c+2c2=18

a11=3c+8c+c2=18

You might be interested in
a positive number is 5 times less than another positive number. Six times the lesser number plus 3 times the greater is 3. Find
IgorLugansk [536]
<h2>Greetings!</h2>

Answer:

One number is \frac{5}{7} and the other number is \frac{1}{7}

Step-by-step explanation:

Let x be the smaller number and y be the bigger number.

x = x

y = 5x

6x + 3y = 3

6x + (3 * 5x) = 3

6x + 15x = 3

(÷3)

2x + 5x = 1

7x = 1

x = \frac{1}{7}

6x + 3y = 3

6(\frac{1}{7}) + 3y = 3

\frac{6}{7} + 3y = 3

3y = 3 - \frac{6}{7}

3y = \frac{15}{7}

Divide both sides by 3 to get 1y:

y = \frac{5}{7}

So one number is \frac{5}{7} and the other number is \frac{1}{7}


<h2>Hope this helps!</h2>
5 0
3 years ago
Which is the length of the third slide of the right triangle
irina [24]

Answer:

27

Step-by-step explanation:

if you do pathagorean therom

8 0
2 years ago
I need a helping hand
skelet666 [1.2K]

Answer:it’s the third one

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Judges in a diving competition gave scores of 9.3, 9 1/2, 9 4/5, 9.95 And 9 1/4. Which two scores were closest to one another?
Kazeer [188]

9.3 and 9\frac{1}{4} were closest to another.

<u><em>Explanation</em></u>

First we will convert each given fractions into decimal form. So....

9\frac{1}{2}= 9+\frac{1}{2} = 9+0.50 =9.50\\  \\ 9\frac{4}{5}= 9+ \frac{4}{5}= 9+0.80=9.80\\   \\ 9\frac{1}{4}= 9+\frac{1}{4} =9+0.25= 9.25

Then the scores are: 9.30, 9.50, 9.80, 9.95 and 9.25

So, 9.30 and 9.25 are closest to another as their difference is (9.30-9.25)=0.05

That means , 9.3 and 9\frac{1}{4} were closest to another.

6 0
3 years ago
Read 2 more answers
It takes a guinea pig about 68 days to develop comepletely before it is born. Which of these is less than 68 days
irakobra [83]
67 add the anwers though just so i can make sure

7 0
3 years ago
Read 2 more answers
Other questions:
  • A video game sets the points needed to reach the next level based on the function g(x) = 10(2)x − 1, where x is the current leve
    5·2 answers
  • 100 POINTS PLUS BRAINLIEST QUESTION ATTACHED
    6·2 answers
  • Twenty percent of 150 is
    7·1 answer
  • table Given the graph of a linear function, identify the steps used to find the initial value. Check all that apply. Find the ra
    14·2 answers
  • Please help i have no clue what to do
    11·1 answer
  • Please help me with this question
    13·1 answer
  • Find an equation of the line perpendicular to Y equals 3X -3 and passes through the point -3 and -1
    10·1 answer
  • The Toy Company sells two types of kids' basketball hoops, Jordan size and Shaq size.
    12·1 answer
  • Can someone help me out ​
    12·1 answer
  • NEED HELP ASAP
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!