Question

What is the nth term in the sequence 3, 7, 11 . . .?

4n + 2

4n − 1

4n + 3

3n + 2

Answer 1

Plug in n=3

Into each answer choice. And whichever one gets you 7 will be your answer

Answer 2

b

Answer 3

gets you 7?

Answer 4

For example

4(3)+2 = 14
That is not 7, so A is wrong.

Answer 5

none of gets me 7

Answer 6

???

Answer 7

Are you sure you posted the correct answer choices?

Answer 8

Im 100%

Answer 9

Well then there is something wrong with the answer choices, or with the question.

Answer 10

freckle help me out wouldnt it be A

Answer 11

cause its a pattern

Answer 12

they go up 1 each number

Answer 13

\[a_n=a_1+d(n-1)\]
this is going to be the nth term

Answer 14

a_1 is the first number

Answer 15

d is the common difference

Answer 16

can you identify both of those for me please?

Answer 17

I mean they go down 1

Answer 18

so it would be 5,4,3

Answer 19

7-3 isn't 1

Answer 20

5,4,3,2

Answer 21

can you tell me please what the first number is in your sequence
that will be a_!

Answer 22

a_1

Answer 23

3,7,11,13

Answer 24

I want you to identify for me
what a_1 is (which is also known as the first number in your sequnce)
and also d (which is known as the common difference)

Answer 25

4(3)+3=16

Answer 26

d can be found by doing either of these differences:
7-3
11-3
or
13-3

Answer 27

ok

Answer 28

It has to be C

Answer 29

can you tell me what both of the numbers I asked for are?
and we will have the answer shortly after that

Answer 30

ok

Answer 31

a1=3

Answer 32

and d?

Answer 33

-3

Answer 34

no d is the common difference
it can found by doing
7-3
or
11-7
(oops I didn't meant to put 13-3 or whatever earlier; lol)

the point is 7-3 and 11-7 are both 4
there is a common difference
we do have an arithmetic sequence
a1=3 and d=4
plug them in
\[a_n=a_1+d(n-1) \\ a_n=3+4(n-1)\]
distribute and combine like terms and you are done!

Answer 35

3n-3 4n-4

7n-7

Answer 36

no :(

Answer 37

3+4(n-1)
3+4n-4
can you combine like terms now?

Answer 38

what is 3-4?

Answer 39

1

Answer 40

-1 right?

Answer 41

-1

Answer 42

3+4(n-1)
distribute
3+4n-4
4n+3-4
4n-1

Answer 43

my fault was quick to answer that 3-4

Answer 44

as you see this gives you your sequence
for n=1 we have 4(1)-1=4-1=3
for n=2 we have 4(2)-1=8-1=7
for n=3 we hve 4(3)-1=12-1=11
and so on...

Answer 45

the other guy told me to plug in 3

Answer 46

I can't explain that
But I can explain why 4n-1 is the answer :p

Answer 47

as I did above
do you still not understand somethin?

Answer 48

Yea I understand now sorry for acting like a dumb retrice

Answer 49

No! You aren't dumb.

Answer 50

It is called learning. And we can all feel dumb when learning but you aren't actually dumb.

Answer 51

thank you

Answer 52

np :)