With math plz ! giving brainlist : d

Your answer to No. 1 is correct

2. arithmetic series with d = 4:_
an = 3 + 4(n-1)

3. this is a arithmetic  sequence  with a1 = 9 and d = -5
a128 = 9  -5(128-1) =  -626

4. Geometric series with r = -2

an = a1 r^(n-1)
     =  -3* -2(n-1)

a97 =  -3* -2^(97-1)  =   4.75368975 * 10^29

3123532488697 x 5676576876896786= 17,730,972,299,573,261,776,980,672,842