Asked by Lola

Find the rule for 9,16.8, 24.6, 32.4
Answered by Ms. Sue
16.8 - 9 = 7.8

Answered by Lola
i left out the part that you need to put it in nth term
Answered by Anonymous
a(n)=a(n-1)+7.8

OR

a(n)=a1+(n-1)*d

a(n)=9+(n-1)*7.8


In google type:
arithmetic progression

When you see list of results click on some site.

wikipedia is good choice