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There is NO subscript below Hydrogen, therefore there is ONE Hydrogen atom.

Explanation: The subscript is the number you’ll see below an element. (ie. The 3 under Oxygen in HNO3) Since there is no subscript under hydrogen, this means there is only 1 hydrogen atom. (Because having 0 atoms isn’t possible)

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Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].