31 is 25x3+8x3=51 because you multiply each of the numbers for it to equal 51
The equation of the tangent line is 
To find the tangent to the hyperbola
at (x₀, y₀), we differentiate the equation implicitly to find the equation of the tangent at (x₀, y₀).
So, 
So, at (x₀, y₀)

So, the equation of the tangent line is gotten from the standard equation of a line in point-slope form
So, 
So, the equation of the tangent line is 
Learn more about equation of tangent line here:
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None parallel means they are the same but are side by side, they don't touch or meet
Answer:
160 u^3
Step-by-step explanation:
For the sake of ease, I will split this prism into 2 prisms. One prism will be 2x4x5 while the second one will be 4x5x6. The volume of the prism will be the sum of the volume of both prisms.
Prism A: Volume would be lwh or 2*4*5=40
Prism B: Volume would also be lwh which is 4*5*6=120
40+120=160
The volume is 160 units^3
Hope this is correct and helps!