Two angles are congruent if and only if they have the same measure. write a definition based on the biconditional. a. two angles have the same measure. b. two angles are congruent. c. two angles are congruent if they have the same measure. d. if they have the same measure, then they are congruent.

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?