Find an equation for the nth term of the arithmetic sequence.
a19 = -92, a20 = 6
an = -1856 + 98(n - 1)
an = -1856 - 98(n - 1)
an = -1856 - 98(n + 1)
an = -1856 + 98(n + 1)
@dan815 @jim_thompson5910 @mathstudent55 @compassionate @zzr0ck3r

At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

Get our expert's

answer on brainly

SEE EXPERT ANSWER

Get your **free** account and access **expert** answers to this

and **thousands** of other questions.

- anonymous

- katieb

I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!

Get this expert

answer on brainly

SEE EXPERT ANSWER

Get your **free** account and access **expert** answers to this

and **thousands** of other questions

- jim_thompson5910

First isolate d
\[\Large a_{19} + d = a_{20}\]
\[\Large -92 + d = 6\]
\[\Large d= ???\]

- anonymous

-86 @jim_thompson5910

- anonymous

then what do we do? @jim_thompson5910

Looking for something else?

Not the answer you are looking for? Search for more explanations.

## More answers

- jim_thompson5910

you add 92 to both sides

- jim_thompson5910

6+92 = ??

- anonymous

98 @jim_thompson5910

- jim_thompson5910

so d = 98

- jim_thompson5910

which is why the answer is
|dw:1436316159029:dw|

- jim_thompson5910

|dw:1436316211464:dw|

- jim_thompson5910

first term is \[\Large a_1 = -1856\]
|dw:1436316259108:dw|

- jim_thompson5910

common difference is d = 98
we add 98 to each term to get the next term
|dw:1436316282925:dw|

- anonymous

so a is the final answer? @jim_thompson5910

- jim_thompson5910

yeah

- jim_thompson5910

|dw:1436316316037:dw|

- anonymous

can u help me with another one? @jim_thompson5910

- jim_thompson5910

sure

- anonymous

Find an equation for the nth term of the arithmetic sequence.
-17, -13, -9, -5, ...
an = -17 + 4(n + 2)
an = -17 x 4(n - 1)
an = -17 + 4(n - 1)
an = -17 + 4(n + 1)

- jim_thompson5910

what's the first term?

- anonymous

i dont know @jim_thompson5910

- jim_thompson5910

just look at the first number given in the sequence

- anonymous

-17 @jim_thompson5910

- jim_thompson5910

yeah

- jim_thompson5910

what must we add to -17 to get to the next term -13 ?

- anonymous

- jim_thompson5910

so d = 4

- jim_thompson5910

First term
\[\Large a_1 = -17\]
Common difference
\[\Large d = 4\]

- jim_thompson5910

|dw:1436316606279:dw|

- anonymous

so the answer would be c?
@jim_thompson5910

- jim_thompson5910

|dw:1436316636005:dw|

- jim_thompson5910

|dw:1436316659391:dw|

- jim_thompson5910

yes, c

- anonymous

Find an equation for the nth term of a geometric sequence where the second and fifth terms are -2 and 16, respectively.
an = 1 â€¢ (-2)n - 1
an = 1 â€¢ 2n
an = 1 â€¢ (-2)n + 1
an = 1 â€¢ 2n - 1
@jim_thompson5910 one more?

- jim_thompson5910

show me what you have so far

- anonymous

i dont have anything? i dont know how to do it?

- anonymous

- jim_thompson5910

second term = -2
third term = -2*r = -2r
fourth term = (-2r)*r = -2r^2
fifth term = (-2r^2)*r = -2r^3
-------------------------------------------------------
solve for r
-2r^3 = 16

- anonymous

how do i do thta? @jim_thompson5910

- jim_thompson5910

you need to isolate r
try to get r all by itself

- jim_thompson5910

think to yourself
-2 times _________ = 16
what goes in the blank?

- anonymous

r

- jim_thompson5910

-2 times _________ = 16
think of a number that goes in the blank

- anonymous

i got 1.25

- anonymous

- jim_thompson5910

no

- anonymous

so what is it?

- jim_thompson5910

this article may help
http://www.purplemath.com/modules/solvelin.htm

- jim_thompson5910

it shows how to solve equations

- anonymous

i dont know? im stupid lol @jim_thompson5910

- jim_thompson5910

read that article a few times. It should help
you aren't stupid

- anonymous

can u show me step by step im more of a visual person @jim_thompson5910

- jim_thompson5910

for example
2 times x = 10 means x = 5
since 2 times 5 = 10

- jim_thompson5910

2q = 28 means q = 14
because 2 times 14 = 28

- jim_thompson5910

you can divide both sides by 2 to isolate the variable

- anonymous

so then its r^3=-8 @jim_thompson5910

- jim_thompson5910

very good

- jim_thompson5910

to undo the cube exponent, we take the cube root of both sides
|dw:1436317751492:dw|

- jim_thompson5910

|dw:1436317761724:dw|

- anonymous

i got this 1Â±iâˆš3

- jim_thompson5910

|dw:1436317773660:dw|

- jim_thompson5910

only focus on the real solutions

- jim_thompson5910

|dw:1436317819217:dw|

- anonymous

so the answer is a?

- jim_thompson5910

|dw:1436317839091:dw|

- jim_thompson5910

yeah it's the only one that fits

- jim_thompson5910

so a1 has to be 1

- anonymous

one last one? @jim_thompson5910

- anonymous

Write the sum using summation notation, assuming the suggested pattern continues.
-1 + 2 + 5 + 8 + ... + 44
summation of negative three times n from n equals zero to fifteen
summation of the quantity negative one plus three n from n equals zero to fifteen
summation of negative three times n from n equals zero to infinity
summation of the quantity negative one plus three n from n equals zero to infinity

- anonymous

Looking for something else?

Not the answer you are looking for? Search for more explanations.