Solve the following system of
–2x+5)=21
-7x-2y=15

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

Three times the sum of a number and seven is negative thirty-six. what is the number?

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).