Don't use a space, hyphen or period. Prism does not distinguish between upper and lower case letters in variable names. Use parentheses as necessary to show the order of operations. Use a single equals sign to assign a value to a variable. You don't need any special punctuation at the end of a statement.
Prism treats the two lines as one.
Comments can begin anywhere on a line. You don't have to write your equation on one line. Use intermediate variables to simplify longer equations. Prism automatically distinguishes between intermediate variables and equation parameters that you can fit. If a variable is used first on the left side of an equals sign, then it is an intermediate variable.