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
Murrr4er [49]
3 years ago
14

Write the explicit formula for the geometric sequence. a1 = -5 a2 = 20 a3 = -80

Mathematics
1 answer:
Anni [7]3 years ago
6 0
a_1 = -5;\ a_2 = 20;\ a_3 = -80 \\\\a_2:a_1=r\ and\ a_3:a_2=r\\\\r=20:(-5)=-4\ check\ r=-80:20=-4\\\\a_n=a_1r^{n-1}\to a_n=-5\cdot(-4)^{n-1}=-5\cdot(-4)^{-1}\cdot(-4)^n\\\\=-5\cdot\left(-\dfrac{1}{4}\right)\cdot(-4)^n=\dfrac{5}{4}\cdot(-4)^n\\\\Answer:\boxed{a_n=-5\cdot(-4)^{n-1}\ other\ a_n=\frac{5}{4}\cdot(-4)^n}
You might be interested in
C(25,10)<br> Find permutation and combination
Verizon [17]

C(25,10)= 3268760

P(25,10)=11861676288000

hope it helps but these are very big numbers :d

6 0
3 years ago
Solve the following please
Dima020 [189]

Answer:

x=4

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Lainey is sliding down a water slide that is 420 feet long at a rate of 42 feet per second. How long will it take Lainey to trav
BARSIC [14]

Answer:

10 seconds.

Step-by-step explanation:

420/42 = x amount of seconds.

It took Lainey 10 seconds.

3 0
3 years ago
a rectangular prism has a square base with a side length of 10 inches. The volume of the prism is 1,600 cubic inches. Find the s
Liula [17]

Answer:

840 in^2

Step-by-step explanation:

If the base is square and the side length is 10 inches, the areas of the base and of the top combined is 2(100 in^2).

The height of the prism comes from dividing the volume, 1600 in^3, by the area of the base, 100 in^2:  It is 16 in.  Then the combined areas of the four sides of the prism is 4(160 in^2).

The total surface area of the prsim is then 640 in^2 + 200 in^2, or 840 in^2.

7 0
2 years ago
(3x-4)^2 - (2x-1) ^2​
Len [333]

Step-by-step explanation:

Hope it helps u

Plz mark as brainlist

8 0
3 years ago
Other questions:
  • Which of the following numbers has 5 in the ten thousands place A. 652,341. B. 562, 341. C. 462,541. D. 265,401
    8·2 answers
  • Translate the verbal phrase into an algebraic expression. The sum of 3 and 5y multiplied by 17.
    8·1 answer
  • In rectangle KLMN, KM =6x + 16, and LM =49. find the value of x
    13·1 answer
  • Express the decimal 0.907 as a percent?
    5·2 answers
  • cooghan asked his 19 classmates whether they were right or left-handed. there were 5 more right-handed classmates than left-hand
    10·1 answer
  • Work out the percentage change to 2 decimal places when a price of £99 is increased to £111.
    15·1 answer
  • Which is the reciprocal of the mixed number, 5 5/6 ?
    6·2 answers
  • HELP DUE IN 15 MINS! ΔLMN ~ ΔPQR. Which of the following sets of side lengths could be those of ΔLMN?
    12·2 answers
  • What is the distance between (-6,4) and (-8,6)? Choose 1 answer:
    11·1 answer
  • The robots will be taking over ⅓ of the normal work. you have hired 4 robots. How much of the total work will they be doing?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!