Geometric Sequences

So i have these few questions that i need help and answers for:

1.Find the 7th term of this geometric progression which begins 2, -6, 18.
2. The first four terms of a geometric progression are 84, 42, 21, 10.5.
a) Write down the common ratio of the progression.
3. Find the 7th term of this geometric progression which begins -6250, 1250, -250.

Please help me ASAP because im supposed to be 'top student' and I always have my work submitted within 20 mins of it being set (for maths anyways)

Thanks x

So i have these few questions that i need help and answers for:

1.Find the 7th term of this geometric progression which begins 2, -6, 18.
2. The first four terms of a geometric progression are 84, 42, 21, 10.5.
a) Write down the common ratio of the progression.
3. Find the 7th term of this geometric progression which begins -6250, 1250, -250.

Please help me ASAP because im supposed to be 'top student' and I always have my work submitted within 20 mins of it being set (for maths anyways)

Thanks x