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Parts of algebraic expressions$\newline$Onsider the expression$\newline$$$\frac{1}{2}(2 a+1)(a+3) \text {. }$$$\newline$Complete $2$ descriptions of the parts f the expression.$\newline$$1$. The entire expression is the product of$\newline$$2$. On its own: sum wi$\newline$$2$ terms$\newline$$2$ factors$\newline$$3$ factors$\newline$$2$ terms$\newline$$3$ terms