exam Maths Puzzle Numerical Ability

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?

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A slope passing through (9,15) and (2,y) is parallel to a line with slope 2. What is the value of y? on the axes provided sketch the graph of y--x^2-6x-5
answer all the following:

x intercept

y intercept

vertex

intervals where f(x)is increrasing

intervals where f(