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simplify the polynomial.

–3f2 + 4f – 3 + 8f2 + 7f + 1

a. 5f2 – 11f + 2

b. 11f2 + 11f + 2

c. 5f2 + 11f – 2

d. –5f2 + 11f – 2

What is best way to getting answer for my exam is

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters

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