its really easy say you wanted to find the percentage correct if you got 20/30 for an exam you simply divide 20 by 30 and then times the answer by 100 eg 20/30 = 0.6666 0.6666 x 100 = 66.66 so your percentage is 66.66% !!!
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Sure. You can always 'solve for' a variable, and if it happens to be the only variable in the equation, than that's how you solve the equation.
You cannot solve an expression. You need an equation or inequality.You cannot solve an expression. You need an equation or inequality.You cannot solve an expression. You need an equation or inequality.You cannot solve an expression. You need an equation or inequality.
Solve by factoring. Solve by taking the square root of both sides.
when you find the value, you SOLVED the equation. you CHECK the equation when you substitute the value in the variables place and check that the equation is true.
Not sure what you mean by "zero element". If an expression is equal to zero, and you can factor it, then at least one of the factors must be zero; this is often useful to solve an equation.