This one is.
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TRUE!
A open sentence is an equation with one or more variables is an open sentence.
No, it is not. True is an adjective (predicate adjective) because it follows a linking verb (is). The adjective "true" modifies the subject, which is "answer."
An identity.
A sentence is made up of two expressions connected by an equal sign or an inequality sign (such as <). If there's an '=' sign, it's an equation, otherwise it's an inequality. A sentence with a variable in it is called an open sentence - you need to put a number in for the variable to see whether it is true or false. If the sentence has no variable in it, then we can decide whether it is true or false. Examples of a true sentences: 1 + 6 = 7 4 > 2 5 + 17 = 11 times 2 .