The picture shows a barn door:

A barn door has two parallel bars, each of length 4 feet. A support AB runs across the diagonal between the two parallel bars.

What is the distance BC between the two horizontal parallel bars? (1 point)

4 divided by cos 45 degrees

4 sin 45°

4 divided by tan 45 degrees

4 tan 45°

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?