100 points
which equation represents the following word problem: a car is traveling twice as fast as a truck. if their combined speed is 105 miles per hour, find the speed of the car and find the speed of the truck.
a. 3s = 105
b. s + s = 105
c. s(2s) = 105
d. s = 105

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).