Which of the following is true for two complementary angles ∠RST and ∠TSU?
Question 4 options:

A)

m∠RST + m∠TSU = 90°

B)

m∠RST + m∠TSU = 180°

C)

m∠RST = m∠TSU

D)

m∠RST = ½ × m∠TSU

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).