Question

a 1= 18, d = –10, n = 12

Answer 1

looks like some information about sequences .... arithmetic maybe?

Answer 2

it is A.P

Answer 3

a1 = 18
a2 = 18 - 10
a3 = 18 - 10 - 10
a3 = 18 - 10 - 10 - 10
...
a12 = 18 - .........

Answer 4

no just regular, i just need an answer

Answer 5

we are not here to "just give an answer"

we are here to help you learn and study concepts

Answer 6

whats a formula i can use for these problems

Answer 7

brute math is one approach.

just keep subtracting 10 from to get to the next term ... until you get to the a12 term

Answer 8

an=a+(n-1)d

Answer 9

simply solve from this

Answer 10

we can also develop a formula

a1 = 18

a2 = 18 - 10
= a1 - 10

a3 = 18 - 10 - 10
= a2 - 10
= a1 - 10 - 10
= a1 -10(2)

a4 = 18 - 10 - 10 - 10
= a3 - 10
= a1 -10(2) - 10
= a1 - 10(3)

...

the pattern that develops is:

a1 = 18 - 10(0)
a2 = 18 - 10(1)
a3 = 18 - 10(2)
a4 = 18 - 10(3)

...

an = 18 - 10(n-1)

Answer 11

how do i know hwat "a' is

Answer 12

"a" is not a variable, its a name ...

Answer 13

a1 defines the first term, or element, of the sequence of A

A = {a1, a2, a3, a4, a5, ..., an, ...}

the rule for A is: an = a1 -10(n-1)

Answer 14

so with the formula an=a+(n-1)d what do i put for a

Answer 15

that was the other persons shorthand for stating the first term:

a1= 18, d = –10, n = 12
^^^^^^
they used "a" instead of "a1"

Answer 16

im still jsut not getting the right answer

Answer 17

im not sure what answer you are getting .... can you post how you are workng it?

Answer 18

an=a+(n-1)d
an+18+(12-1)-10
an+18-110

Answer 19

thats a fair assessment

but lets clean that up some, since n=12

\[\large a_{12}=18-10(12-1)\]
\[\large a_{12}=18-110\]
what is 18 - 110?

Answer 20

-92

Answer 21

then without any other information to go by ... -92 would be what you are trying to obtain

Answer 22

the answer choices are -552,-888,768, and -444

Answer 23

yeah, thats odd. can you post a screenshot?

Answer 24

idk how to do that on a computer , but doesnt that make no sense?

Answer 25

there are a few keys that selodom get used: prnt scrn, scroll lock, pause .... the prnt scrn button copies whatever is on your monitor

paste that into a paint file and save; then attach the file with the attach file button at the bottom of this screen

Answer 26

or paste it into a word document ... and save