If one of the test subjects is randomly selected, find the probability that the subject tested negative or used marijuana. Give answer as a decimal rounded to 2 decimal places.

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?