exam Maths Puzzle Numerical Ability

New Problem, Factor:

s2 + 2 s - 3

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exam Other Question

sorry i cant seem to figure this one out
SOLVE FOR X

0.05x+0.065(5000-x)=295

THANKS ALOT need help with the addition method
x-2y= -24 you have to subsitute the numbers in the equation. Thanks!
-6x-3y=9