exam Maths Puzzle Numerical Ability

34. Perform the operation and write the result in standard form: (3+sqrt-5)(7-sqrt-10)
46. Write the quotient in standard form: -5/2i
58. Simplify the complex number and write in

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Find the points of intersection of the graphs:

x^2/4 + y^2/9 =1 & y = -x-2 Karen and John take 3 hours to clean the house. Karen alone can clean the house 1 hour faster than John can clean the house alone. What is the total time it takes Karen to clean the house alone.