exam Maths Puzzle Numerical Ability

can someone please help me with this problem:

Which of the following is a line perpendicular to y = 1/2x + 4 ?

a. y = 1/2x - 1/4
b. y = 2x - 4
c. y = 2x - 1/4
d. y = -2x

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exam Other Question

find out 3 irrational numbers between 5/7 and 9/11/ Well, there were no questions submitted for this area. I wish these questions were out of a textbook because then I would have an example that I could follow, but they are not. As