What is CLXXIX in standard form (roman numerals)

A.678
B. 178
C.567
D.179

Julie buys 2kg of apples and 7kg of pears ? 12.70. the pears cost ? 1.30 per kilogram what is the price per kilogram of the apples? show your working out

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.