Answer: b
Step-by-step explanation: hope this helps
It will take 7 weeks and both will have $610
30x7=210+400=610
55x7=385+225=610
50 + 3x = 7x + 12
This is because of the exterior angle theorem.
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a) 
because it is equal to the area of the shaded region between X=4 and X=6, and the probability that X falls within some interval is given by the area under the PDF.
b) 
because the shaded region is a rectangle of height 1/5 (by virtue of X following a uniform distribution over the interval [2, 7], which has length 5).
