exam Maths Puzzle Numerical Ability

pg. 432,

find the domain for each of the following funcions.

23. y= x +4 divided by x squared minus 4x

i dont even know where to begin, or what to look for...

teacher: rapalje

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exam Other Question

Three towns a b c lie in a straight road in the order. The distance from B to C is 6 miles more than twice the distance from A to B. The distance from A to C is 2 miles more than 4 times the distance from A to B. What is the distance from A to b? Commercial airliners fly from NY to Paris 5 times as fast, or 400 miles/hour
faster than the Lindbergh's plane.
A. at what speed did Lindberghs plane fly?
B. At what speed do co