book Maths Puzzle Numerical Ability

x2 +8x -84 =0

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book Other Question

Can someone out there help me with this problem?

A store has T-shirts on sale at 2 for $5.50. At this rate, what do five T-shirts cost?

Thanks,
Lyn I need help solving this problem:
X-2 X-1
___ = _____

X-3 X+1