None of the above will be correct for the expressions are equivalent to 2r + (t + r).
What is the expression?
There are many different ways to define an equation. The definition of an equation in algebra is a mathematical statement that demonstrates the equality of 2 mathematical expressions.
The same sign is used in an equation to indicate that two expressions are equivalent in a formula.
In another word, expression is a set of variables constrained by an equal signs. Sometimes inequality signs are also described as constraints but it will be more and fewer types of constraints.
For example y = 2x +6 then it is shown for every x there is a single unique y.
Given equation is 2r + (t + r) so
2r + (t + r) = 2r + t + r = 3r + t which is not matching among any option hence the none of the above option will going to be correct.
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