exam Maths Puzzle Numerical Ability

Find the axis of symmetry.
y = -x^2 - 2x + 8

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exam Other Question

Betty and Frank, working together can paint the exterior of a house in 3 days. Frank, by himself can complete the job in 8 days less than Betty. How long will it take Betty to complete the job by herself? please help me I do not understand this problem.

Evalute pqa + p-q if p=6,q=1/2,and a=5