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To determine which expression is equivalent to a+b+c(d+2), we need to apply the properties of operations.
Applying the distributive property, we can distribute the c to both d and 2 inside the parentheses:
a + b + c(d+2)
= a + b + cd + 2c
Therefore, the expression that is equivalent to a + b + c(d+2) is a + b + cd + 2c.