exam Maths Puzzle Numerical Ability

find the domain of each function
a)
h(x)= x+3/x-5
b)
P(x)= sq rt x^2+7

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exam Other Question

3x-3y+3z=-27
2x+2y+3z=-3
-3x+2y+2z=-3 A bus leaves a station at 1 P.M., traveling west at an aver-age
rate of 44 mi/h. One hour later a second bus leaves the same station, traveling
east at a rate of 48 mi/h. At what time will the two buses be 274 mi apart?