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The two major types of computer chips are Microprocessor and Primary memory chips.

When a muscle is contracted and relaxed some amount of heat is released as a by product. 

Land is considered as an important resource because it is useful in producing many things. For example, in agriculture, land is used for cultivating the crop, in industrial use, it is used for constructing factories and to make products that we use.

James Madison was the one who became President in the future after writing The federalist papers. Alexander Hamilton, James Madison and John Jay were the three who wrote The federalist papers. 

Here the given expression, 

X2 + X2 is an algebraic expression. Here in this expression the terms are like terms. Now to add them, add their coefficients.

Here in the given expression, the like terms are two X2

Hence, adding their coefficients i.e, 1 + 1 = 2

Therefore, 

X2 + X2 = 2X2.