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
sukhopar [10]
2 years ago
6

Please help with this

Mathematics
1 answer:
inysia [295]2 years ago
6 0

Answer:

S_{n}<em> = n² + 4n ; n = 11 </em>

Step-by-step explanation:

S_{n} = \frac{n}{2} [2 a_{1} + (n - 1)d]

~~~~~~~~~

a_{1} = 5

d = 7 - 5 = 2

S_{n} = \frac{n}{2} [ 2(5) + 2(n - 1)] = \frac{n}{2} ( 8 + 2n ) = 4n + n²

S_{n}<em> = n² + 4n</em>

n² + 4n = 165

n² + 4n - 165 = 0

(n + 15)(n - 11) = 0 ( n ≥ 0 ) ⇒ <em>n = 11</em>

You might be interested in
A 4-column table with 3 rows. The first column has no label with entries before 10 p m, after 10 p m, total. The second column i
MArishka [77]

Answer:

the answer is A=0.1 and B=0.85

Step-by-step explanation:

just took the test on edge

5 0
3 years ago
Read 2 more answers
What is the product of 41 and 8.4 x 10^4 expressed in scientific notation?​
LenaWriter [7]

Answer:

3.44 x 10^6

Step-by-step explanation:

41 x 8.4 = 344.4

344.4 x 10^4 = 3.44 x 10^4+2

6 0
2 years ago
A Playstation 5 gaming console is initially priced at $500 and the price rises such that the new price is $550. What is the perc
konstantin123 [22]

Answer:

10%

Step-by-step explanation:

raises $50 from $500 500/50= 10=10%

8 0
3 years ago
You roll a six sided die what is the probability of rolling a 4 or an odd number
12345 [234]

Answer:

we need an out of sorry -_-

5 0
3 years ago
Read 2 more answers
A calculator screen shows a number in scientific notation as 4.18E‒8. Write this number in standard form.
Citrus2011 [14]

Answer:

.0000000418

Step-by-step explanation:

So you will start from the decimal and move 8 places to the left.

E-8 is the same as 10^-8 so you will move to the left

If it was E8 you would move to the right 8 places.

6 0
3 years ago
Other questions:
  • Which polynomials are prime? Check all that apply.
    10·2 answers
  • The machine described has standard deviation σ that can be fixed at certain levels by carefully adjusting the machine. What is t
    14·1 answer
  • For every 5 apples that Sean picks, Ashley picks 9. Yesterday, they picked a combined total of 168 apples. How many apples did A
    9·1 answer
  • Which of the following equations are equivalent to -2m - 5m - 8 = 3 + (-7) + m?
    8·2 answers
  • 1 pts
    11·1 answer
  • You need to rent meeting
    5·1 answer
  • What is the exact area of a circle with a diameter of 18 feet?
    7·1 answer
  • A candidate scored 32 marks out of 80, find his percentage score
    6·1 answer
  • If DE=6x what is the perimeter of the triangle in terms of x? <br><br> A 6<br> B 18 <br> C 18x
    10·1 answer
  • Factor the expression completely 2x^2-18
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!