Alan

To find the mean, add up all the numbers and divide the result by 6 (the number of items).

UK = £2500*1.55$/£ = $3875

US =  $3000

UK - US = $875 = $875/1.55$/£  =     £564.52

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"The parabola y = x^2 is reflected about the x-axis, then translated, so it has a turning point of (-3,5). What is the quadratic equation to represent this parabola?"

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"A truck with 42-in.-diameter wheels is traveling at 60 mi/h. ..."

60mph = 63360 inches/minute

Circumference of wheel = 42pi inches

Number of revolutions per minute = 63360/42pi ≈ 480

Number of radians per minute (angular speed) = Number of radians per revolution*Number of revolutions per minute = 2pi*63360/42pi ≈ 3017 

"Solve loga 8x^2 - loga 8= loga(2x+15"

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"when 100 g of liquid water initally at a temperature of 33 c freezes, the entropy of the water:

A.decreases

B.does not change

C.could either increase or decrease it depends on other factors

D. increases"

In order for the water to reduce in temperature it must lose heat to it's surroundings.  The entropy of the water will decrease and that of the surroundings will increase.  

The heat lost by the water = the heat gained by its surroundings, but, since the surroundings must be at a lower temperature to start with, the entropy of the surroundings will increase by more than the entropy of the water decreases (entropy = heat gained or lost divided by temperature).

Perhaps this will help:

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I think "concrete" line might refer to the "solid" line, Chris, as opposed to the "dashed" line.

Incidentally, you can't have the energy in Newtons (a measure of force).  I suspect you meant Joules (which is what I've assumed in my calculation above).