(6 ) 0 a general 2 x 2 diagonal matrix has the form thus the two unknown o b real numbers a and b are needed to specify each 2 x 2 diagonal matrix. how many unknown real numbers are needed to specify each of the given matrices:
a) an upper triangular 2×2 matrix?
b) an m×n matrix?
c) a symmetric n×n matrix?

Circle d circumscribes abc and abe. which statements about the triangles are true? statement i: the perpendicular bisectors of abc intersect at the same point as those of abe. statement ii: the distance from c to d is the same as the distance from d to e. statement iii: bisects cde. statement iv: the angle bisectors of abc intersect at the same point as those of abe. a. i only b. i and ii c. ii and iv d. i and iii e. iii and iv

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Alex took his brother to a birthday party. the party was scheduled to last for 1 and 3/4 hours but they stayed for 4/5 of an hour more. how long did she stay at the party?