The distance, d km, travelled by a car is directly proportional to the amount, a litres, of petrol
used. when a = 5, d = 270
a) express d in terms of a.
b) find the value of d when a = 4.5
c) how many litres of petrol are needed for a journey of 324 km?

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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).

Which of the following domains provide a real value periods