in a group of 40 ballpoint pens on a shelf in a stationery department of metro department store, 2 are known to be defective if a costumer selects 3 of these pens what is the probability that at least one is defective

Ill mark the brainliest if you me with the these three questions 7,8,9

What is 74 round to the nearest ten

The john nash mall used 17,4000 kilowatt hours in may, with a peak load of 92 kilowatts. the demand charge is $5.95 per kilowatt, and the energy charge is $0.08 per kilowatt hour. the fuel adjustment charge is $0.017 per kilowatt hour. what is the total electricity cost for may?