exam Maths Puzzle Numerical Ability

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x^2+8x+13=0

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exam Other Question

Please Help,
What is the product of 2Radical 7 + 3 radical 5 and is conjugate?

also
Solve the following equations:
a) 4 + radical x+1 = 5

b) 2/7 = 5/3x-1

c) c-7/c+2 = 1 A bus leaves a station at 1 P.M., traveling west at an average 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?