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255cm²

Step-by-step explanation:

area of triangle=1/2 . 10 . 7=35cm²

area of rectangle =10x22cm²=220cm²

total area of polygon = 35+220cm²=255cm²

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answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0

49%

step-by-step explanation:

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