exam Maths Puzzle Numerical Ability

A vehicle travels 125.7 feet while its weels revolve 16 times.Find the diameter of the wheels to the nearest inch.

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exam Other Question

Find the solution of sin 2θ=cos θ if 0� Let f(x)--3x+1 and g(x)=x to the second power +2 Find the fallowing:

(f+g)(x)

and

(g-f)(x)

I don't understand at all. Please do these step by step.
Thank You