Find The Term Named In The Problem ( Can You Explain How You Found It ?)

-30, -25, -20, -15 ; Find a20
A: a20=65
B: a20= 48
C: a20= 52
D: a20= 46

Question

Find The Term Named In The Problem ( Can You Explain How You Found It ?)

-30, -25, -20, -15 ; Find a20
A: a20=65
B: a20= 48
C: a20= 52
D: a20= 46

mandre · Answer

Looks like you've left something out. What is a20 supposed to be? What is "The Problem"?

nnesha · Answer

arithmetic sequence because you are adding 5 every time
now you have to find 20 terms 
you have to use formula
or either you can continue adding 5 until you do 20 times 
formula is to find 20 terms |dw:1414052716679:dw|
where a1 is first term
n is next term (term you have to find )
and d is common difference which is 5