(3 + 5)( 3 − 5 )=
Alguien me ayuda

Ill mark the brainliest if you me with the these three questions 7,8,9

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

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).