Find the sum of the first 12 terms of the sequence. show all work for full credit. 1,-4,-9,-

Let's find the rule where.

1-(-4)=5

-4-(-9)=5

It looks like we are subtracting 5 from the previous number. Since we know the rule, let's write out all.

1, -4, -9, -14, -19, -24, -29, -34, -39, -44, -49, -54; let's add them.

-318 is the sum

.632

step-by-step explanation:

6 * 1/10 = 3/5

3*0.01 = 0.03

3/5 + 0.03 = .63

2*0.002 = .002

.63 + 0.002 = .632