Find the sum of the first 9 terms of the sequence. show all work for full credit.

2, -7, -16, -25, .

(-306)

Step-by-step explanation:

We have to find the sum of the first 9 terms of the sequence

Sequence is 2, -7, -16, -25 ....

As we can see in this sequence there is a common difference of T₂ - T₁

= -7 -2 = (-9)

Formula to calculate the sum of n terms of an arithmetic sequence is

Where a = first term = 2

d = common difference = (-9)

and n = number of terms = 9

[ 2× 2 + (9-1) (-9) ]

= [4-72]

= [-68]

= 9 (-34)

= (-306)

pooopoopopoopop

step-by-step explanati∵∵∴∴on:

jjhjhhjjh

step-by-step explanation: