The spatial arrangement of electrons groups around the central atom is called?
A- geometric design
B- electron-group geometry
C- electronegativity
D- electron-pair repulsion

Idont understand the question

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

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.