3x+2 x is a variable. A variable is a symbol (x, y, etc...) that does not have an assigned value.
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The answer to the question is given in the question!If you want to find the value of an algebraic expression, then you need to substitute numerical values for each of the variables in the expression, and then calculate and simplify the result.
0.25
multiply the expression by the power, then decrease the power by one: = 4sinx3
They mean that the expression to the left of the sign is greater than or less than (as appropriate) the expression to the right of the sign.
Sin(42 o ) = 0.669130606 = 0.6691 ( 4 d.p._.