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
Liula [17]
3 years ago
15

Given Sn=2n^2 - 5n, find

Mathematics
1 answer:
brilliants [131]3 years ago
6 0

Answer:

a) -3

b) 117

c) 100

Step-by-step explanation:

(a) 2(1)²-5(1)

1²= 1

2×1= 2

2-5= -3

(b) 2(9)²-5(9)

9²= 81

81×2= 162

162-45= 117

(c) 2(4)²-5(4) +2(8)²-5(4)

4²=16

16×2= 32

32-20= 12

8²=64

64×2= 128

128-40= 88

88+12= 100

hope it helps!

You might be interested in
Y
stich3 [128]

Answer:

w

Step-by-step explanation

q bert

5 0
3 years ago
There are 12 jurors sitting in a circle
STALIN [3.7K]
I believe you are asking in how many ways they can sit. If so:
The 1st can sit anywhere: he has only 1 way to sit
The 2nd can sit in 11 ways, since one seat is already occupied
The 3rd can sit in 10 ways, since 2 seat are already occupied
The 4th can sit in 9 ways, since 3 seat are already occupied
The 5th can sit in 8 ways, since 4 seat are already occupied
--------------------------------------------------------------------------------
The 12th can sit in 1 way, since11 seat are already occupied
General formula for a circular table:

Number of ways they n persons can be seated: (n-1)!
and the 12 can be seated in (12-1)! = 11! = 39,916,800 ways.
This is called circular permutation
3 0
3 years ago
Refer to the given table on air travel. Suppose a flight that arrived at El Centro is selected at random. What is the probabilit
Triss [41]
In probability, you study the chances of an event to happen based on statistics gathered. Probability is always expressed as a part of a whole, thereby in fractions or percentages. From the statistics gathered, it said that 80% of the time, the plane arrives right on schedule in El Centro. That means that the probability of NOT arriving on time is the other portion, which is 20%. Thus, the answer is 20%.
5 0
3 years ago
Thomas invested $40,000. He put part of the money in an account paying 2% interest and the remainder
Rainbow [258]

Answer:

18,000 at 2%

22,000 at 3%

Step-by-step explanation:

x: the amount in account paying 2% interest

y: the amount in stock paying 3% interest

x + y = 40,000

2%. x + 3%. y = 1020

⇒ x = 18,000

y = 22,000

5 0
2 years ago
HELP PLSSS AND THXXX
Harlamova29_29 [7]

Answer:312cm. Squared I think

Step-by-step explanation:

3 0
3 years ago
Other questions:
  • Algebra question please help me
    9·2 answers
  • Ross worked 43 hours in a certain week. He was paid $8.50 per hour and time and a half for all hours over 40. Determine his gros
    5·2 answers
  • Which sequence is ARITHMETIC?
    8·2 answers
  • You rent 2 DVDs and 1 video game for $12. The following week, your friend rents 4 DVDs and two video games for $24. Which of the
    13·1 answer
  • What's the plotting points for two thirds
    12·1 answer
  • Please answer in number order, no need to explain just answer
    8·1 answer
  • The classic 60° triangle has a hypotenuse of length 2, an opposite side of length √3 and an adjacent side of length 1....find th
    10·1 answer
  • Cole deposits $500 into his savings account. The bank pays him 2% interest on the amount he has in his account. What expression
    7·1 answer
  • Please could someone correct this question and give me the explanation and example please
    15·1 answer
  • Please help I’ll give Brainly please
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!