exam Maths Puzzle Numerical Ability

A corn mean feed is 10% protein and a feed supplement is 40% protein. How much of each must be conbined to get 2400 pounds of feed that is 19% protein?

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exam Other Question

Find an equation of a hyperbola with vertices at (-9,4) and (-5,4) and asymptotes y=3x+25 and y=-3x-17.
End behavior of of each graph of the polynomial..

-6d^3 -4d^2 +2d -1

I got.. a<0 n odd.. because the function d has odd degree and a negative dominating term.

is that correct?