Write an explicit formula for the sequence and find the first 5 terms
a1=100, r=-20
a1=10, r=-1

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.

a - base

b - exponent

so,