Book Maths Puzzle Algebra

How can I simplify this equation? Is this equation linear or nonlinear?

f(x1,x2,x3)= 10.5-2*EXP(-.91*x1)-3.5*EXP(-.52*x2)-5*EXP(-.35*x3)

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Book Other Question

2x over xsquared minus 16 + x over x + 4 2 with a square root of 50