Problem 1: Vince works at a restaurant and earns $15 per hour. On Friday, he worked "t" hours at the restaurant, and his neighbor paid him $10 per
hour to babysit for "b" hours. Write an expression that represents the
amount Vince earned on Friday.

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).