Question

Which function below represents the arithmetic sequence 3, 7, 11, 15...?
f(n) = 4 + 3(n – 1)
f(n) = 4 + 3n
f(n) = 3 + 4n
f(n) = 3 + 4(n – 1)

Answer 1

i can help on this one if you'd like

Answer 2

Sure, thanks

Answer 3

you can see that its just adding 4 to every number correct?

Answer 4

pretty much yeah

Answer 5

so with every number 4 will be added, hence the variable n

Answer 6

yea..

Answer 7

still can't figure it out?

Answer 8

i can i can i can i can i can i can i can i an i can i can now i can./...

Answer 9

ok what is it ?

Answer 10

i think its D

Answer 11

hint: the variable is next to 4

Answer 12

mmmmm try again

Answer 13

lol

Answer 14

oops sorry i got it mixed up d is right

Answer 15

@severus4ever

You are correct. It is the last choice.

Answer 16

WHOOHOO

Answer 17

i saw a negative sign somewhere

Answer 18

Watch...I will show you the method...so every time you have an arithmetic sequence, you will be able to write the function on your own (even without choices)....

Answer 19

thanks

Answer 20

For an arithmetic sequence, use

a+ (n-1)d

where a = first term, d = common difference

In this sequence 3,7,11,15,....

d = common difference = 4

a= first term = 3

so we have: 3 + (n-1)(4)

which is the last choice.

It can be simplified to 3 + 4n if you distribute and combine like terms.

Answer 21

thank you so much!

Answer 22

Sorry... 3+ (n-1)(4)
= 3 + 4n - 4
= -1 + 4n OR 4n -1

Answer 23

thanks again, sorry to bother again..but can you also help me with a little science?

Answer 24

@severus4ever
Welcome. I only in mathematics.

Answer 25

I am only in mathematics.

Answer 26

ok thanks anyways