exam Maths Puzzle Numerical Ability

Can you please explain to me step by step how this type of problem is solved.

For f(x) = 2x - 11, find f(2).

I greatly appreciate any help!
Thank you
Patti

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exam Other Question
Use the quadratic formula to solve the equation for (a) x in terms of y and (b)y in terms of x.

1)4x^2-4sy+1-y^2=0



2)2x^2-xy=3y^2+1 Kit earned 75 points out of 80 possible on her test. Write the decimal equivalent of this fraction.