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
astraxan [27]
2 years ago
13

If a1 = 7 and an = -2an-1 then find the value of a5

Mathematics
1 answer:
alukav5142 [94]2 years ago
7 0

Answer:

a_1 = 7 \\ a_n =  - 2a_{n - 1} \\ a_2 =  - 2a_1 =  - 2(7) =  - 14 \\ a_3 =  - 2a_2 =  - 2( - 14) = 28 \\ a_4 =  - 2a_3 =  - 2(28) =  - 56 \\ a_5 =  - 2a_4 =  - 2( - 56) = 112

You might be interested in
Geometry homework I really don’t understand this so can someone please help me.
rewona [7]
1. SSS
2.SAS
3.AAS
4.ASA
5.SSS
7 0
3 years ago
Read 2 more answers
A DEF has vertices D(-5,-1), E (3, 3), and F (1,-5). Find the equation of the altitude through F in
Tems11 [23]

Answer:

y = -2x -3

Step-by-step explanation:

- the altitude trough F is a perpendicular line to the line DE

- find slope of line DE

D ( x2 = -5, y2 = -1); E (x1 = 3, y1 = 3)

slope m = (y2-y1) / (x2-x1) = (-1-3) / (-5-3) = -4/ -8 = 1/2

-find equation of the altitude trough F

lines that are perpendicular have the slope negative reciprocal (negative reciprocal of 1/2 is -2)

y= -2x +b , for point F(1, -5)

-5 = -2*1 +b, add 2 to both sides

-5 +2 = b, combine like terms

-3 =b

equation of the altitude trough F is y = -2x -3

4 0
3 years ago
Help once more please
REY [17]

Answer:

84

Step-by-step explanation:

they are all equal sides so what you'd do is 28+28+28= 84

5 0
3 years ago
Read 2 more answers
In which quadrant do the points (-1,-2) and (-2,3) lie?​
vitfil [10]

Answer: 3 for the first one. and 2 for the second

5 0
3 years ago
One number is 2 less than 3 times another. If the sum of the two number is 14, find the numbers.One number is 2 less than 3 time
Serga [27]

Answer:

Step-by-step explanation:

One number is 2 more than 3 times another. Their sum is 14.Find the numbers. 8, 14 5, 17 2, 20 4, 18 10, 12

7 0
2 years ago
Other questions:
  • What are these fractions in simplest form?
    10·1 answer
  • Sam drove 696 in 12 hours. At this same rate, how long would it take him to drive 464 miles?
    12·2 answers
  • Help me answer just #1 (Basic Geometry)
    10·1 answer
  • HELPFAST What is the sum of -2/6 and 3/2? 10 points
    9·2 answers
  • Please help as soon as possible.
    8·2 answers
  • Choose Yes or No to tell if each pair of expressions is equivalent. 3x + 14 – x + 112 and 4x + 134 Choose... 2 + 6x and 2(3x + 1
    8·1 answer
  • (c) Marlene invests $550 at a rate of 1.9% per year compound interest
    8·2 answers
  • Answer correctly asap don’t troll!!!
    6·1 answer
  • I need help with this
    13·1 answer
  • A certain recipe calls for 3 tablespoons of an ingredient in 22 fl oz of liquid. How
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!