exam Maths Puzzle Numerical Ability

Using one of the laws of exponents, prove that any number raised to the power 0 is 1.

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exam Other Question

If ship is anchored at origin of 3 dim. coordinate sys. and 2 probes are sent below the surface, 1st probe stops at (-8, -4, 6) and 2nd probe stops at
(4, -9, -2) which probe is farather from the ship? the substitution method should be used to solve which system of equations

a.5x-7y=16
2x-7y=12

b.4x+3y=-5
6x-3y=2

c.x=3y+1
2x+y=7

d.2x+6y=3
3x+2y=-1