Alan

We divide by 1000 to turn that term into kilo pascals (kPa).  Without that the first term would be in pascals.  I could, of course, have simply multiplied the second term by 1000 to get it into pascals before adding the rho*g*h term, but would then have had to divide the result of the summation to get it back to kPa, as the possible answers are given in kPa.

0.63*cansproduced = 55 billion

cansproduced = 55/0.63 billion ≈ 87 billion

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If we take the density of blood as 1060 kg/m^3 (just a little thicker than water!) and g = 9.8m/s^2 then:

P_F = 1060*9.8*1.7/1000 + 13.3 kPa   or P_F ≈ 30.96 kPa

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Divide by 10^6

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Try the Wikipedia article: https://en.wikipedia.org/wiki/Theory_of_relativity

h = height of building

d = horizontal distance

h - 20.75 = d*tan(18+16/60)

h+ 20.75 = d*tan(56+28/60)

Subtract the first from the second to find d, then substitute the result into either one of the above to find h.

I guess they are just after the (slanted) surface area of a cone of diameter 36 ft and height 18 ft.  This is given by;

Area = pi*radius*slant height = pi*18*sqrt(18^2 + 18^2)  →  pi*sqrt(2)*18^2  ft^2

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M + 9 > 25    where M is the number of "my" marbles.

I've assumed this is meant to be:   (x^(1/4) + 16)^2 = 144 + x^(3/2)

The real number solution is obtained as follows:

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9.2001*10^3