book Maths Puzzle Numerical Ability

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

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book Other Question

I need help finding the slope and y-intercepts of each equation, and graping for the following equations:
y=x+2
y+3=-1/3x
y=2x-1
y-3/5x=-2
y=1/2x-4
y-2x=-3
y=2/5x+3
y+1/3x=-2
y=-x-2
y-6=-2x x2 +8x -84 =0