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
navik [9.2K]
3 years ago
15

If the sum of first 9 terms of an A.P is equal to sum of its first 11 terms, then what is the sum of its 20 terms?

Mathematics
2 answers:
iVinArrow [24]3 years ago
5 0

Answer:

Put the values into the formula....let me know if you need help....

Step-by-step explanation:

Mamont248 [21]3 years ago
3 0

Answer: 0

Step-by-step explanation:

Sum of the first 9 terms = 9/2 (2a + 8d)

Sum of the first 11 terms = 11/2 (2a + 10d)

S9 = S11

9a + 36d = 11a + 55d

2a = -19d

2a + 19d = 0...........(1)

S20 = 20/2 (2a + 19d)

= 20/2 (0) . .. ............from (1)

S20 = 0

You might be interested in
Can someone help me?! I don’t understand how to do these problems
Dmitriy789 [7]

Answer:

first do 9x40 and get your answer then do 18x3 and get that answer and then add to do answers together

7 0
3 years ago
Read 2 more answers
Out of the 150 students at a summer camp, 72 signed up for canoeing. there were 23 students who signed up for trekking, and 13 o
True [87]

Answer:

Approximately 45% students signed up for neither canoeing or trekking.

Step-by-step explanation:

First we subtract the number of the students who signed up from the number of the total students to find the number of the students who did not signed up for either.

But there are 13 students who signed up canoeing and also for trekking.

Hence the number of students they signed up for activity is

72 + 23 - 13 = 82

And the number of students they not signed up for any activity is

150 - 82 = 68

so 68 students signed up neither for trekking nor canoeing. The percentage of those students are :

\frac{68}{150} × 100 = 45.3333%

Approximately 45% students signed up for neither canoeing or trekking.

8 0
3 years ago
Jamal used 1/3 yard of ribbon to tie a package and 1/6 yard of ribbon to tie a bow how many yards of ribbon did Jamal use?
DaniilM [7]

Answer:

1/2 yard

Step-by-step explanation:

1/3 yard x 6/6 = 6/18 yard

1/6 yard x 3/3 = 3/18 yard

6/18 + 3/18 = 9/18 = 1/2 yard

6 0
3 years ago
A telephone company offers a monthly cellular phone plan for $ 39.99 It includes 300 anytime minutes plus $ 0.25 per minute for
Nataly [62]
A. 39.99 
b. 39.99 + 0.25(35) = 48.74
c. 39.99 + 0.25(1) = 40.24
3 0
3 years ago
1/10 ton of sand to 4/5. What is the ratio in ton per minute?
g100num [7]

1/10 4/5 we need common denominaters so

1/10 4(2)/(5)= 8/10

5 0
3 years ago
Other questions:
  • How do you solve this?........ lmn/4 = x
    13·1 answer
  • Consider the following piece-wise function.
    14·2 answers
  • you invest 2,600 in an account that pays an interest rate of 8.5% compounded continuously. Calculate the balance of your account
    13·1 answer
  • A student said that 3:4 is equivalent to 9:16 and 18:64. What did the students do wrong?
    7·1 answer
  • A book store is having a 30 perscent off sale. Diary of the wimpy kid books are now 6.30 dollars each what was the original pric
    6·1 answer
  • Johanna ran a mile in physical education class. After resting for one hour, her heart rate were 60 bpm. If her heart rate decrea
    11·2 answers
  • Can someone plz explain how to do this?​
    10·1 answer
  • Can someone plz help me... it would be great if u did all three questions
    8·2 answers
  • A car travels 50 km in 2 liters find
    8·2 answers
  • Convert (-6, -6) from Cartesian coordinates to polar coordinates. Round the length to the nearest 0.01 Express the
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!