exam Maths Puzzle Numerical Ability

Solve:
(2x - y = 10
(x + 3y = -9 (Use substitution.)

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exam Other Question

Simplify:
4k(k^3+2k+1) Here is my problem:
Your state government decides to raise money by running a lottery where each tickets cost $1.00 and you must choose four different whole numbers between 1-20.