How many potassium atoms and how many oxygen atoms are there in a binary compound made from these two elements? one potassium and two oxygen

two potassium and one oxygen

three potassium and one oxygen

one potassium and one oxygen

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What kind of enegia produces the mixture of bicarbonate and vinegar  chemical producetion

2.77 x 10^-3 its for plato user 

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.