Mary is 63.5 inches tall and her sister tonya is 70 inches tall. tonya wants to know how many inches taller she is than mary. which equation and solution can be used to solve this problem?

Can someone me and plz do the problem

How do you solve a question like this?

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).