Solve x^2-8x-9=0 algebrically

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.

(60 points) explain this in detail

During a wright loss challenge your friend goes from 125 pounds to 100 pounds. what was the percent weight loss