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
balandron [24]
3 years ago
12

For the geometric sequence -1,-2,-4... find a8

Mathematics
2 answers:
Alinara [238K]3 years ago
4 0
An=a1(r)^(n-1)
a1=first term
r=common ratio

so
firs term is -1

each is double the prevoius
r=2

an=-1(2)^n-1
8th term
a8=-1(2)^(8-1)
a8=-1(2)^7
a8=-1(128)
a8=-128
the 8th term is -128

swat323 years ago
4 0
Geometric sequence formula gn = g1 (r)^n - 1

To find the ratio you divide g2 by g1

G1 = first number in the series



To find g8 you just plug 8 instead of n

g8 = g1 (r)^8 - 1

g8 = -1 (2)^8 - 1

g8 = -128
You might be interested in
What is 144 divided by 960?Working out is needed.
Ipatiy [6.2K]

Answer:

The answer is 0.15

Step-by-step explanation:

Hope this helps!

7 0
2 years ago
Read 2 more answers
hector and maggie are having a typing test hector typed 25 words in 45 seconds maggie typed 32 words in 65 second who typed at a
xenn [34]

Answer:

Maggie typed at a slower rate.

Step-by-step explanation: Maggie typed slower because 32 words/65 seconds is .49 words per second or half a word per second whereas Hector is 25 words/45 seconds or .55 words per second.

8 0
3 years ago
A company uses the function f(x) = 2(3)¥ to project the number of stores that the company will have open x years after the compa
Brilliant_brown [7]
I think it’s d bc it increases by 3 each year
5 0
3 years ago
What is the width (or height) of the parking lot?
Gre4nikov [31]
The width is 146.0315533981 cuz 12033÷82.4 is 146.0315533981
6 0
3 years ago
The angle of elevation from an observer to the bottom edge of the Delaware River drawbridge observation deck located 200 feet fr
aleksklad [387]

The height of the chimney above the floor of the observation deck is 52.4 ft

Two right angle triangle will be formed.

<h3>Right angle triangle:</h3>

Right angle triangle are triangle that has one of its angle as 90 degrees.

Therefore, using trigonometric ratio,

adjacent side = distance of observer from the bottom edge of the Delaware River drawbridge observation deck

Therefore,

tan 40 = opposite / adjacent

Where

x = height of the observer to the top of the observation deck

tan 40 = x / 200

x = 200 tan 40

x = 167.819926235

x = 167.82 ft

tan 30 = opposite / adjacent

y = height of the observer to the bottom of the observation deck

tan 30 = y / 200

y = 200 tan 30

y = 115.470053838

y = 115.47 ft

The height of the chimney above the floor of the observation deck = height of the observer to the top of the observation deck - height of the observer to the bottom of the observation deck

The height of the chimney above the floor of the observation deck = 167.82 - 115.47 = 52.35 ft

learn more on trigonometric ratio here: brainly.com/question/23854119

5 0
2 years ago
Other questions:
  • Graph the line y=−3x+b if it is known that the graph goes through point:
    14·1 answer
  • Which expression is equivalent to 5x-30?<br> A. 5(x-30)<br> B. 5(x-6)<br> C. 5x(x-6)<br> D. x(5-30)
    14·2 answers
  • 729 = blank to the third power
    11·1 answer
  • The gasoline prices in seven stayed are $1.96,$2.09,$1.79,$1.61,$1.75,$2.11 and $1.84 what is the median gasoline price
    12·1 answer
  • Math homework please help
    11·1 answer
  • Find the perimeter of the rectangle with the following vertices. (−6, −2), (0, −10), (5, 2), (−1, 10) 23 52 46 40
    8·1 answer
  • Lcm of 8 and 15 Please!
    6·1 answer
  • Meghan also wants to walk to get some exercise, rather than going to the gym. She decides to walk along arc AB. How far will she
    10·1 answer
  • 20 points please help - geomtry
    9·1 answer
  • Pls Help! John wants to prove ABC = to DEF. He Knoes AB = DE and AC = DF. With Screenshot
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!