book Maths Puzzle Numerical Ability

Can you please help to answer the following question:
.
Sum the series:
1 x 2 x 3 - 2^3 + 3 x 4 x 5 - 4^3 + ... + 9999 x 10000 x 10001 x - 10000^3

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book Other Question

On an automobile trip, Aimee maintained a steady speed for the first two hours. Rush hour trafic slowed her speed by 25 mph for the last part of her trip. the entire trip, a dista Linear systems of equations
x+y=11
x-y=10
where
x=
y=