exam Maths Puzzle Numerical Ability

could someone help me with this?

Which of the following functions is an even function?
1. f(x)=4x-2
2. f(x)=/6x+8/
3. f(x)=3-x^2
4. f(x)=x/x+1

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exam Other Question

the total value of the pennies and nickels was 14.50. hala counted the coins and found that there were 450 in ll.how many of each ocoin did she have? The hypotenuse of a right angled triangle is 2 cm. more than its base and 1 cm. more than twice the perpendicular. Find the sides of the triangle?