I need some help with algebra as I'm confused as to how to solve them.

Find the common difference d and the value of a1 using the information given.

1. a6= 5/4, a8= 9/4

Evaluate each sum.

2. E like symbol that has a 29 on the top. On the bottom n=1 and to the right (4n-1)

Find the indicated term for each sequence.

3. a1=48 r= - 1/3 find a6

4. - 7/8, 7/4, - 7/2, 7, -14....

Find the number of terms in each sequence.

5. a1= -1, an= -1296, r= -squareroot 6