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
Dmitry [639]
2 years ago
14

Find the sum of the first 6 terms of geometric series 2-10+50+.....

Mathematics
1 answer:
barxatty [35]2 years ago
8 0
<h3>Answer:   -5208</h3>

============================================

Work Shown:

term1 = 2

term2 = -10

term3 = 50

term4 = -250

term5 = 1250

term6 = -6250

Each new term is found by multiplying the previous term by -5

Add up the terms

2 + (-10) + 50 + (-250) + 1250 + (-6250) = -5208

-------------

A shortcut is to use a = 2, r = -5 and n = 6 in the formula below

Sn = a*(1-r^n)/(1-r)

S6 = 2*(1-(-5)^6)/(1-(-5))

S6 = 2*(1-15625)/(1+5)

S6 = 2*(-15624)/6

S6 = -31248/6

S6 = -5208

You might be interested in
Please help im very confused
Bingel [31]

Answer:

option D : 130°

Step-by-step explanation:

m∠2 = m∠7 = 130° , (corresponding angles)

6 0
2 years ago
Can someone help me with this Geometry question ASAP, thanks!
slega [8]

We are given an isosceles triangle.

An isosceles triangle has corresponding angles of corresponding sides same.

<em>Therefore, other angle is also of (3x+7) degrees.</em>

(5x+13) and (3x+7) makes a linear pair.

Therefore,

(5x+13) + (3x+7)  = 180

5x +13 + 3x +7 = 180.

8x +20 = 180.

Subtracting 20 from both sides, we get

8x +20-20 = 180-20.

8x = 160

Dividing both sides by 8, we get

<h3>x = 20.</h3><h3>Therefore, correct option is 3rd option. </h3>
4 0
3 years ago
Help please and thanks
marin [14]

Answer:

option A

Step-by-step explanation:

plz mark my answer as brainlist plzzzz . hope this will be helpful to you.

8 0
3 years ago
Read 2 more answers
Which of the sums below can be expressed as 6(3 + 9)?<br> 18 + 54<br> 18 +9<br> 09 + 15<br> 6 + 54
Zinaida [17]

Answer: 18+54

Step-by-step explanation:

6*3=18 and 6*9=54

3 0
3 years ago
Read 2 more answers
9-c=-13<br> What’s the answer
trapecia [35]
First you do -13+9. That equals -4.
Then bring down -c=-4 because there is a 1 in front of the c so -1c.
Next divide both sides by -1. The -c side cancels out so then your left with -4/-1.
That equals positive 4.
C=4
That’s ur answer.
7 0
3 years ago
Other questions:
  • Amy and Fraser walk inside a circular lawn. Point O is the center of the lawn, as shown below: Four points A, B, C and D are sho
    13·2 answers
  • When is a rhombus a rectangle?
    6·2 answers
  • What is the quotient when 9240 is divided by 8?
    10·2 answers
  • I NEED AN ANSWER ASAP (photo)
    6·1 answer
  • Which of the following equations corresponds to the graph below?
    5·2 answers
  • How to write 863.141 in expanded form
    9·1 answer
  • Write a linear function f with f(0) =7 and f(3)=1
    7·1 answer
  • Which of the following expression is equivalent to 6x2−13x−28
    15·1 answer
  • Can someone Help me thanks
    9·1 answer
  • Using the diagram, determine which statements are true. Select all that apply. m∠1 = 50° m∠3 = (2x + x + 25)° m∠2 = (x + 25)° m∠
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!