Question

***WILL MEDAL***
What is the common difference between successive terms in the sequence?

9, 2.5, –4, –10.5, –17, ...

–11.5
–6.5
6.5
11.5

Answer 1

@bibby

Answer 2

the common difference
\(a_n=a_1+(n-1)d
\\a_2\implies2.5=9+(1)d\\2.5-9=d
\\-6.5=d\)

Answer 3

thank you so much!!