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
lozanna [386]
3 years ago
14

The first term of a geometric sequence is 7, and the ratio (multiplier) is 3. what is the sum of the first 5 terms of the sequen

ce? user: what is the 8th term of this geometric sequence? 6, 48, 384, 3072, . . .
Mathematics
1 answer:
Anni [7]3 years ago
4 0
Hello,

1)
a_{1}=7
a_{2}=7*3
a_{3}=7*3^2

a_{n}=7*3^{n-1}

s=a_{1}+a_{2}+a_{3}+a_{4}+a_{5}=7*(1+3^1+3^2+3^3+3^4)
=7*\frac{3^{5}-1}{3-1}
=7*242/2=847

2)
b_{8}=6*8^{8-1}=12582912




















You might be interested in
Please help!!<br> Will mark brainliest
Over [174]
Y would equal to -5. hope this helps
8 0
2 years ago
How do you solve x^2-4X-12=0
Pepsi [2]
                                         x²  -  4x  - 12  =  0

Factor the left side:      (x + 2) · (x - 6)  =  0

The equation is true if either factor is zero.

If  (x + 2) = 0  then    x = -2 .

If  (x - 6) = 0  then     x = 6 .
3 0
3 years ago
Round 69581.491337 to the nearest thousand.
Anika [276]

Answer:

7000

Step-by-step explanation:

lets start with 695

9 is the thousand

you check the number next to 9

less then 4 let it rest

more than 5 let it soar

something like that lol

anyways since 5 is next to the 9 we round up from 9 to the next number which is 10

so that changes the whole number to 7000

hope this makes sense!

3 0
2 years ago
Ann, Chang, and Kareem sent a total of
Gnoma [55]

It is given in the question that

Ann, Chang, and Kareem sent a total of 89 text messages over their cell phones during the weekend. Ann sent 9 fewer messages than Chang. Kareem sent 3 times as many messages as Ann.

Let number of messages Chang sent be x. And Ann sent 9 fewer than Chang, so Ann sent (x-9) messages. And Kareem sent 3 times as many messages as Ann, so Kareem sent 3(x-9) messages.

And the total messages are 89. That is

x+x-9+3(x-9)=89

Combining like terms

x + x - 9 + 3x-27 =89&#10;\\&#10;5x -36=89&#10;\\&#10;5x = 125&#10;\\&#10;x =25

So Chang sent 25 messages, Ann sent

25-9=16 messages

And Kareem sent

3*16 = 48 messages

8 0
3 years ago
what is the probability of drawing a silver marble from a bag that contains 4 blue marbles, 7 silver marbles, and 5 green marble
umka21 [38]

Answer:

7 out of 16

Step-by-step explanation:

Well there are 16 marbles in total, and only 7 silver marbles. So the probability of getting a silver marble is 7/16

3 0
3 years ago
Other questions:
  • A class has 14 girls and 12 boys. What is the probability that a girl's name is drawn at random?
    8·2 answers
  • What type of number can be written as a fraction p/q, where p and q are
    13·1 answer
  • Chelsea paid 1.35 skate rental with dimes and nickels. Only 19 coins in all. How many of each?
    14·2 answers
  • What is the correct solution set for the following graph?
    14·1 answer
  • Please help ASAP!!! Tysm :)
    10·1 answer
  • A sector of a circle has a central angle measure of 300. The diameter of the circle is 26 centimeters What is the approximate ar
    7·1 answer
  • You can use place value to think about the expression 9×6,128
    6·2 answers
  • The radius of a cone is decreasing at a constant rate of 6 meters per minute. The volume remains a constant 154 cubic meters. At
    12·1 answer
  • Find the perimeter of this adjoining figure​
    7·1 answer
  • 3(2x + 5)= 4 (c-3) I know how to solve it but can someone explain it.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!