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Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)