=
+
(
@
Answer is Right!
Answer is Wrong!
The correct answer is: A. =
A formula is an expression that uses mathematical symbols to represent a relationship between quantities. All formulas must begin with the equal sign (=). This is because the equal sign indicates that the expression on the left-hand side of the equation is equal to the expression on the right-hand side of the equation.
The other options are not correct because they are not mathematical symbols that are used to represent relationships between quantities. The plus sign (+) is used to add two quantities together. The parentheses () are used to group together quantities. The at sign (@) is not a mathematical symbol.