Which selection best completes the blank lines in the proof for line 5 and 6 5.) Reflexive Property

6.) SSS Congruence Postulate

5.) Reflexive Property

6.) SAS Congruence Postulate

5.) Definition of isosceles triangle

6.) ASA Congruence Postulate

5.) Distributive property

6.) SSS Congruence Postulate

Suppose there are 10 five and six-year-old attending a birthday party. when a 30 year old mother walks into the room with an infant in her arms, what happens to the mean age in the room? what happens to the standard deviation of ages in the room? a. the mean and standard deviation of both change. b. the meaning will change, but the standard deviation will stay approximately the same. c. i mean will stay approximately the same, but the standard deviation will change. d. the mean and standard deviation will both stay approximately the same.

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

Having a hard time understanding this question (see attachment).