book Maths Puzzle Numerical Ability

If the length of thread on a bolt is equal to twice the diameter plus 1/4",
how much thread would a 1/2" (diameter) bolt have?

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book Other Question

please help me solve this equation y=3x-2 Without graphing, identify the following pair of lines as either "parallel", "perpendicular", or neither.

y = 4x + 4
y = -4x +3