exam Maths Puzzle Numerical Ability

y=2/3 x-1
y=-x+4

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Problem#44 Section: 5.3

Find the perimeter of the given figure

the figure is a rectangle on the top for the width it has :

(x)/(2x-5)

the figures height is:

(8)/( Professor W. counts his midterm as 2/3 of the grade and the final as 1/3 of the grade. Wendy scored a 48 on the midterm. What range of scores does she need to earn on the final to give Wendy an average between 70 and 79?