exam Maths Puzzle Numerical Ability

If 2 ipods and 3 movie downloads cost $31
If 2 ipods and 2 movie downloads cost $29
What is the cost of each?
use x for ipods and y for downloads.

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exam Other Question
how do you write 10^-3, 5 x 10^-3, 8 x 10^-2, 4 x 10^-1 in order from least to greatest? please help with proof

given triangle psr is a right triangle with altitude sq drawn to hypotenuse pr

prove pr/ps =ps/pq



thanks