an equation
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It is an algebraic expression, if there are numbers and variables. For example: 2x + 2 = 4x(7-5) 20-29 = -9/3x If there are ONLY numbers and NO variables, it is called an arithmetic expression. For example: 3+3+3+3 = 4+4+4 2+6 = 4+4
If you replace variables in an expression by numbers (in case there are any variables) and then do the indicated operations, you get a number. That final number is the "value" of the expression.
That's eight letters, so: 8! = 40320 different arrangements. n! means "factorial", and the expression expands to n*(n - 1)*(n - 2) ... * 2 * 1
An angle cannot be formed by only one ray. However, an angle formed by two opposite rays is called a straight angle.
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