Algebra is used, for instance, you want to carpet a room.
the area of a rectangle is the length of the side times the width & if it's written in feet, i.e. a room 8' x 6' would be 48 sq feet. it would be called the square footage of that area (example: how many square feet of carpet do you need to cover the floor of a room). You would need 48 squares 1' x 1' to cover the area
you use it to figure out miles/gallon and many, many more things on a daily basis
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Algebra is useful in creating formulaes!
yes. to understand the higher maths you need pre algebra
They typically aren't useful in your everyday life unless your job requires them.
Because the square root of the discriminant is a component of the roots of the equation.
Umm... first of all this question isn't grammatically correct, but I'll answer the question, "How useful are whole numbers in real life?". They are useful to know when you when you are taking an algebra class:)