If you mean m^2 -8m +15 then it equals (m -3)(m -5) when factored
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2*(8*5 + 5*3 + 3*8) = 2*(40 + 15 + 24) = 2*79 = 158 m2
If it were, then 17 squared would equal 8 squared plus 15 squared. ie 289 would equal 64 + 225 which it does, so it is a pythagorean triangle.
Pressure can only be expressed as n/m2 (not n.m) 1 n/m2 = 1 pascal
8m + (4n - 6m) + 9n =8m + 4n - 6m + 9n =(8m - 6m) + (4n + 9n) =2m + 13n
It's 0.008 km. A km is equal to 1000 metres. To convert from metres to km, you have to divide by 1000.