Question

Find an equation for the nth term of the arithmetic sequence.
-17, -13, -9, -5, ...
hellppppp pleaseee

Answer 1

First thing you have to know is whether it is A.P or G.P

Answer 2

a.p or g.p?

Answer 3

Arithmetic progression
Geometric progression

Answer 4

Arithmetic

Answer 5

From here you can tell that it's AP, yes

Answer 6

find the difference between each number (i.e. 4), set up initial progression 4n+b
then work out what b is by calculation
-17 = 4n+b
b=-21
so your progression is 4n-21

Answer 7

the common difference is
d=-13-(-17)=4

Answer 8

ohhh okay thank you. could you help me with another one?

Answer 9

yeah

Answer 10

Then follow what @epicfail said

Answer 11

so I got 17 + 4(n - 1)

Answer 12

Write the sum using summation notation, assuming the suggested pattern continues.
2 - 6 + 18 - 54 + ...