Answer:

An arithmetic sequence is a sequence that has the property that the difference between any two consecutive terms is a constant. This constant is called the common difference. If a1 is the first term of an arithmetic sequence and d is the common difference, the sequence will be: {an}={a1,a1+d,a1+2d,a1+3d,…}

Step-by-step explanation:

a =first term and d = common difference.

S3= (2a+2d)3/2=-3

(a+d)=-1

S5=(2a+4d)5/2=10

a+2d=2

d=3 a= -4