book Maths Puzzle Numerical Ability

For f(x) = 3x - 5, find f(2).

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book Other Question

how do you solve the absolute value of x/2+2=the absolute value of x/2-2 ? Could someone help me solve this problem?

Find the circumference of 3.75 ft. Use 3.14 for pie and round your answer to one decimal place.
Thanks!
Sher