A large chocolate bar has trapezoidal cross section shown in the following figure.If you want the bar to have volume 861 cm3, what should H be? 
Definitions:
Neurotransmitter
Any specific chemical agent released by a presynaptic cell on excitation that crosses the synaptic cleft and stimulates or inhibits the postsynaptic cell.
Autocrine
A mode of hormone action where a cell targets itself, releasing and responding to its own secreted molecules.
Lipid-Soluble
Lipid-soluble refers to molecules that can dissolve in fats and oils, allowing them to easily pass through cell membranes that are made of lipid layers.
Water-Soluble
Capable of dissolving in water, referring to substances that can be easily dispersed in an aqueous environment.
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