book Maths Puzzle Numerical Ability

Write the first four terms of the sequence aV1=-3, aVn=(-2)aVn-1;n=2,3,4
I have no idea how to do this problem. Please help me.

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book Other Question

This is the problem: Jane has 132 more marbles than Mary has. If their mother gives 25 marbles to each of them, Jane will have 5 times as many marbles as Mary. How You decide to build a box that is 4 feet long ,5 feet wide, and 8 feet high. The distance from the top left front corner to the top righ tback corner is ? feet.
The distance from the bottom left front corner to the top right back corner is ? feet.