Which equations are true? choose all answers that are correct. a. m∠3 = m∠1 + m∠2 b. m∠3 = m∠1 – m∠2 c. m∠1 = m∠2 + m∠3 d. m∠1 = m∠2 – m∠3

Atextile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. the company wishes to test the hypothesis upper h subscript 0 baseline colon mu equals 12 against upper h subscript 1 baseline colon mu less-than 12 using a random sample of n equals 4 specimens. calculate the p-value if the observed statistic is x overbar equals 11.8. round your final answer to five decimal places (e.g. 98.76543).